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Voles - Your Mortal Enemies!
All Crops Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho
Voles
Posted on: November 13, 2024 by Jeff Miller
Jason Thomas, University of Idaho Extension Educator, is working to better understand the impact of vole damage on Idaho farms and gather insights on how farmers like you have been affected. This information is crucial for helping us advocate for resources and support to address this issue effectively.
Please complete the 5-minute survey by clicking the link below, calling the Minidoka County Extension office at 208-436-7184 to do so over the phone or if you prefer to fill out a physical survey please email jasont@uidaho.edu with your address so he can send one out to you.
Thank you in advance for your valuable input—it makes a big difference!
https://uidaho.co1.qualtrics.
» https://uidaho.co1.qualtrics.com/jfe/form/SV_6KKoB4cTSn6p1Yy
TREASURE VALLEY PESTICIDE PRE-CERTIFICATION TRAINING
All Crops Treasure Valley, Treasure Valley - Idaho
Posted on: November 1, 2024 by Jemila Chellappa
Prepare for Your Idaho Pesticide License Exam!
Join us in person on November 8 from 8:00 am to noon at the University of Idaho Research and Extension Center for a comprehensive training program designed to help you and your team get ready for the Idaho State Department of Agriculture (ISDA) pesticide exams.
Date/Time: Friday, November 8, 8:00am - Noon
Location: UI Caldwell R & E Classroom 1904 E. Chicago St., Caldwell
Register: Call UI Extension, Canyon County 208-459-6003
What is included:
- Education on Idaho State pesticide regulations
- Training on how to effectively read and interpret pesticide labels
- Review exam preparation strategies
- Exclusive access to online practice modules and exams!
Cost: $15.00 per participant https://bit.ly/24PesTraining
This training provides an interactive way to engage with study materials, gain critical knowledge, and benefit from examples and discussions that reinforce key concepts. There will be plenty of opportunities for review and Q&A.
Special Offer:
Get free access to our online course, which includes additional resources and practice exams to help you prepare at your own pace!
Questions? Contact
canyon@uidaho.edu / 208-459-6003
The University of Idaho has a policy of nondiscrimination on the basis of race, color, religion, national origin, sex, age, sexual orientation, gender identity/expression, disability, genetic information, or status as any protected veteran or military status. Persons with disabilities who require alternative means for communication or program information or reasonable accommodations need to contact University of Idaho Extension Canyon County one (1) week prior at 501 Main St., Caldwell, 208-459-6003 or canyon@uidaho.edu.
Pesticide Applicator Recertification Seminar
All Crops All Locations
Posted on: November 1, 2024 by Jeff Miller
The University of Idaho is hosting the Pesticide Applicator Recertification Seminar on December 4 in Burley (Burley Best Western) and on December 5 in Twin Falls (Herrett Center, CSI).
Morning session: registration begins at 7:45 and the program runs from 8:30 to 12:00 pm (3 credits).
Afternoon session: registration at 12:30 and the program runs from 1:00 to 4:30 pm (3 credits).
The cost to attend is $35 (cash, card, or check) whether you attend the whole or half day.
Contact Linsy at the Jerome Extension office (208-324-7578, lin...@uidaho.edu) to RSVP.
Topics include:
Management of Russian Olive
Managing vole infestations in agriculture
Pesticide safety: Best practices for applicators
Environmental impacts of pesticides
Impacts of pesticide overuse
Beneficial insects for pest management
Manure and weed seeds
Pasture and range plants that endanger livestock
ISDA pesticide applicator program updates
Top applicator violations in Idaho
Tricounty/Cassia County weed control programs
Increasing efficiency of applications and reducing overapplication
2024 Idaho Association of Plant Protection Annual Meeting
All Crops All Locations
Posted on: October 11, 2024 by Jeff Miller
All are invited to the 2024 annual meeting of the Idaho Association of Plant Protection November 6-7 at the Herrett Center in Twin Falls! The cost to attend is $30 ($20 for students). Wed. credits = 2 ISDA, 4 CCA IPM. Thurs. credits = 2 ISDA, 3.5 CCA IPM. The agenda is attached and more information can be found at: https://millerresearch.com/event/2024-idaho-association-of-plant-protection/
» https://millerresearch.com/event/2024-idaho-association-of-plant-protection/
2024 ISDA Pesticide Disposal Program
All Crops All Locations
Posted on: August 24, 2024 by Jeff Miller
From the ISDA website:
Homeowners, growers, dealers, and professional applicators storing unusable or unwanted pesticides will have a safe and free opportunity to dispose of them at an ISDA pesticide disposal site.
ISDA pesticide disposal sites will take most pesticides including herbicides, insecticides, fungicides, rodenticides or anything ending with “cide.” No high-pressure canisters, fertilizer, micronutrients, paint, solvents, motor oil, or rinsates other than seed treat rinsates will be accepted. Loads exceeding 1,000 pounds must be pre-registered.
- Idaho Falls / Bonneville County Transfer Station – August 27th 9:00 a.m. to 1:00 p.m.
2455 Hemmert Ave, Idaho Falls, ID 83401 - Twin Falls / Twin Falls County Highway District – August 28th 9:00 a.m. to 1:00 p.m.
3208 E 3700 N, Twin Falls, ID 83301 - American Falls / Power County Transfer Station – Sept. 10th 9:00 a.m. to 1:00 p.m.
2950 Landfill Rd, American Falls, ID 83211 - Burley / Bureau of Land Management Field Office – Sept. 11th 9:00 a.m. to 1:00 p.m.
3630 Overland Rd, Burley, ID 83318
More information can be found at the ISDA website.
» https://agri.idaho.gov/pesticides/pesticide-disposal-program/
Parma Field Day 2024
All Crops Treasure Valley, Treasure Valley - Idaho
Posted on: July 12, 2024 by Jemila Chellappa
PARMA RESEARCH AND EXTENSION FIELD DAY
2 Idaho and 3 Oregon pesticide credits available
Date and Time: Thursday, August 8th, 2024 @ 7:15 am – 11:30 am
To cover field research on crops including onions, beans, sugar beets, hops, potatoes, corn, and carrots. To include demonstrations involving varieties, plant disease management, nematology, insect pests, and more. Idaho and Oregon pesticide education credits are expected to be offered.
Venue: University of Idaho Parma Research and Extension Center,
29603 U of I Lane, Parma, ID 83660
Schedule:
o 7.15 am: Registration, breakfast, posters, and displays
o 8 am – 11.30 am: Field tours and presentations
All are welcome!
No need to pre-register.
For further information
Contact: James Woodhall (jwoodhall@uidaho.edu)
Cercospora Leaf Spot in Sugarbeet
Sugarbeets All Locations
Cercospor Leaf Spot
Posted on: July 12, 2024 by Oliver Never
Sugarbeets - Treasure Valley, Western Magic Valley
University of Idaho and Amalgamated Sugar Company personnel have identified Cercospora leaf spot in fields near Parma ID, Wilder ID, and Glenns Ferry ID. Incidence is still low, however, most fields have closed rows, Cercospora spores have been detected in spore traps deployed in the Treasure Valley, and environmental conditions have been conducive for infection for a couple of weeks now.
If fungicide applications have not yet occurred, we strongly encourage everyone to start spraying against Cercospora leaf spot.
Several fungicides are available but be aware of multiple fungicide-resistant strains of Cercospora. Depending on the disease pressure and chemistry used, applications with different chemistries should be repeated every 14 days. Using a protectant such as copper products, EBDCs, or hydrogen peroxide with every spray is strongly recommended.[https://www.srcoop.com/articles/2024_Fungicide_Recommendations.pdf ]
Contact your crop consultant from the Amalgamated Sugar Company to discuss suitable fungicides for your area, to report a loss of fungicide efficacy, or if you have any questions.
Click on the link below for the Cercospora leaf spot pages in the PNW Plant Disease Management Handbooks.
https://pnwhandbooks.org/plantdisease/host-disease/sugar-beet-beta-vulgaris-cercospora-leaf-spot
Cercospora Leaf Spot in Sugarbeet - 2024
Sugarbeets Treasure Valley, Treasure Valley - Idaho, Magic Valley
Cercospora Leaf Spot
Posted on: July 7, 2024 by Oliver Neher
Sugarbeets- Treasure Valley, Western Magic Valley
University of Idaho and Amalgamated Sugar Company personnel have identified Cercospora leaf spot in fields near Parma ID, Wilder ID, and Glenns Ferry ID. Incidence is stilllow, however, most fields have closed rows, Cercospora spores have been detected in spore traps deployed in the Treasure Valley, and environmental conditions have been conducive for infection for a couple of weeks now.
In case fungicide applications have not yet occurred, we are strongly encouraging everyone to start spraying against Cercospora leaf spot. There are several fungicides available [https://www.srcoop.com/articles/2024_Fungicide_Recommendations.pdf ] but be aware of multiple fungicide resistant strains of Cercospora. Depending on the disease pressure and chemistry used, applications with different chemistries should be repeated every 14 days. The use of a protectant such as copper products, EBDCs, or hydrogen peroxide with every spray is strongly recommended.
Contact your crop consultant from the Amalgamated Sugar Company to discuss suitable fungicides for your area, to report a loss of fungicide efficacy, or if you have any questions.
Click on the link below for the Cercospora leaf spot pages in the PNW Plant Disease Management Handbooks.
https://pnwhandbooks.org/plantdisease/host-disease/sugar-beet-beta-vulgaris-cercospora-leaf-spot
Canyon County Emergency Management Storm Assessment
Announcements Treasure Valley
Posted on: June 28, 2024 by Jemila Chellappa
For anyone in the County who knows anyone who might have been affected by the storm a few days ago please see the information below and share it with your friends and family who might have been involved:
Canyon County Office of Emergency Management is trying to gather information from people who were affected by the microburst that came through our area on Tuesday, June 25, 2024. If your property or crops received any type of damage from the storm, please fill out this form.
Please send photos/attachments to the following email address with a description of the location and what was damaged. Email information to: emergencymanagement@canyoncounty.id.gov
Here is the link: https://forms.gle/BhxwVV4r27K8RLiq9
Pest Alert: Western cherry fruit fly in Idaho
Cherry All Locations
Western Cherry Fruit Fly
Posted on: June 10, 2024 by Jemila Chellappa
Crop: Cherry
Problem Description:
The first Western cherry fruit fly has been found in an Idaho State Department of Agriculture Western cherry fruit fly trap in Western Idaho. If treatment for the Western cherry fruit fly is not already underway, it should begin now.
Contact for further Information: vene.stewart@isda.idaho.gov
» https://pnwhandbooks.org/insect/tree-fruit/cherry/cherry-western-cherry-fruit-fly
2024 Ag Talk Tuesday sessions to resume
All Crops All Locations
General announcement - all crops
Posted on: April 4, 2024 by Kasia Duellman
The University of Idaho Ag Talk Tuesday sessions will resume once again in 2024. Join us for our 7th season of these live Zoom sessions held every first and third Tuesday, May through August. The sessions start at 11:00 AM (MDT) and typically conclude by Noon (MDT).
Registration is required to attend. The registration link is available on our website: https://www.uidaho.edu/ag-talk
During each Ag Talk Tuesday session, we invite contributions regarding timely information on crops in Idaho and the Pacific Northwest. These Crop Updates are then followed by a Featured Topic with Guest Speakers for deep dives into ag-related topics of interest.
Below is our current 2024 (Draft) Agenda for Featured Topics (subject to change):
- May 7: Water Update (Keith Esplin, Eastern Idaho Water Rights Coalition) and Ag Outlook (Josh Huff, Ag West Farm Credit)
- May 21: Soil arthropods and soil health: Belowground partners in PNW wheat systems (Dane Elquist and Sanford Eigenbrode*, University of Idaho) (*presenter)
- June 4: To be confirmed
- June 18: Family farms and corporate farms - what is the Idaho landscape? (Brett Wilder, University of Idaho)
- July 2: Entomology at Parma REC (Dr. Armando Falcon-Brindis, University of Idaho)
- July 16: Nematodes (Dr. Pooria Ensafi, University of Idaho)
- Aug 6: Annual alfalfa as a source of nitrogen for subsequent small grain crops (Reed Findlay*, Dr. Jared Spackman, Joseph Sagers, Justin Hatch, Tom Jacobsen, Jared Gibbons; University of Idaho) (*presenter)
- Aug 20: Idaho crop profitability outlook (Dr. Pat Hatzenbuehler, University of Idaho)
Looking forward to seeing you at Ag Talk Tuesday!
Sincerely,
Your Ag Talk Tuesday Organizers:
- Kasia Duellman (kduellman@uidaho.edu)
- Doug Finkelnburg (dougf@uidaho.edu)
- Pam Hutchinson (phutch@uidaho.edu)
- Juliet Marshall (jmarshall@uidaho.edu)
Pesticide recertification seminars at the Western Idaho Ag Show
Announcements All Locations
Posted on: January 11, 2024 by Ronda Hirnyck
Six pesticide recertification credits offered at the Ag Show. Location: "The Center at the Fair", Canyon County Fairgrounds, Caldwell, ID.
WESTERN IDAHO AG SHOW –JANUARY 23-24, 2024
Pesticide Seminars for Recertification Credit
Day 1—January 23, 2023-Tuesday.
WESTERN IDAHO AG SHOW – JANUARY 24-25, 2023
Day 2 – January 24, 2024 --Wednesday
Job announcement - Farm Assistant II, UI Kimberly REC
All Crops All Locations
General announcement - all crops
Posted on: December 14, 2023 by Kasia Duellman
All:
The University of Idaho Kimberly Research & Extension Center is advertising a full-time position with benefits. Please forward to anyone who may be interested in applying.
This position will operate tractors and other field equipment, plant, fertilize, cultivate, spray, and harvest in support of research and non-research related crops. Perform routine maintenance on machinery and equipment. Irrigate some weekends. Perform backup facilities maintenance at the Kimberly R&E Center. Contribute to team effort by creating a work environment that emphasizes teamwork and safety.
Here is the link to the position: https://uidaho.peopleadmin.com/postings/43031
Need Pesticide Credits for 2023?
Announcements All Locations
Posted on: November 7, 2023 by Kimberly Tate
Enroll in the University of Idaho (UI) Extension Pesticide Safety Education Program (PSEP) for the 2023 Fall Recertification Webinar Series (held via Zoom; no camera/no account required). Attend for $10 per applicator/per webinar. Completed webinar(s) receive one Idaho State Department of Agriculture pesticide credit(s)*. Note: ALL webinars are held at Mountain Time (MT).
- Nov. 14 from 2–3 p.m. (MT) — Ronda Hirnyck: Changes to pesticide regulations; What the applicator needs to know!
- Nov. 21 from 2–3 p.m. (MT) — Doug Finkelnburg: Avoiding herbicide residual issues in cropping systems
- Nov. 28 from 2–3 p.m. (MT) — Albert Adjesiwor, Ph.D.: Palmer Amaranth and Waterhemp, the Troublesome Pigweeds: Identification, early detection, and rapid response
- Dec. 5 from 2–3 p.m. (MT) — Ariel Agenbroad: Assessing beneficial insect habitat on your farm or property
- Dec. 12 from 2–3 p.m. (MT) — Tom Jacobsen: Minimizing pesticide resistance
- Dec. 19 from 2–3 p.m. (MT) — Brad Stokes: Overview of invasive organisms in Idaho and their treatment options
Registration will close at noon (MT) on the day of the webinar.
*For pesticide credit: Pesticide applicators must answer questions within the webinar session. This requires individual computer and internet access for each user. Answers will be collected to confirm attendance was maintained for the entire webinar. The Zoom platform does not recognize multiple users connected with the same email address. Be sure to utilize different identifying information.
Register Today: https://marketplace.uidaho.edu/C20272_ustores/web/store_main.jsp?STOREID=53&SINGLESTORE=true
Need more information? Contact Kimberly Tate, UI Extension Pest Management Instructor by phone (208) 364-4581 or email ktate@uidaho.edu.
2022 Extension Drought Resources
General Landscape and Garden Treasure Valley
Posted on: April 24, 2022 by Nic Usabel
If you are looking for ways to conserve water during this growing season here are a number or resources available from various Extension programs.
- University of Idaho Extension Drought Resources
- Utah State University Extension Drought Resources
- Watering a Home Landscape During a Drought, Colorado State University
- Native Plant Landscaping: Curb Appeal and Low Water Use, University of Idaho
- Landscaping with Native Plants, University of Idaho
- Idaho Climate & Weather Resources, University of Idaho
- U.S. Drought Monitor for Idaho, National Drought Mitigation Center
For additional questions reach out to a local Extension office. Find a local University of Idaho Extension Office.
2022 Dry Spring Conditions
General Landscape and Garden Treasure Valley - Idaho
Posted on: March 25, 2022 by Nic Usabel
Much of Idaho has experienced below average precipitation this past winter and it continues into early spring. The Treasure Valley is no different. During periods with low water resources, it is important to prioritize watering needs. While some lawn conditions appear dry it is not yet time to begin the watering of residential lawns. Consider the following as a prioritization to follow during times of low water resources:
- Young or newly transplanted trees which have a limited root system. Ensure to proper application of water and water deeply and infrequently based on soil texture.
- Established trees and shrubs should also be given consideration to priority watering as established plants are high value and take many years to replace. When applying water to trees and shrubs apply at an appropriate rate that allows water to soak into the soil to a depth of 12 inches. Frequency of water depends on soil texture and if water restrictions are in place. General guides are as follows: April once per month, May through September up to twice per month.
- Fruit gardens, vegetables gardens, and flowers are generally next on the list of prioritizations. Consider using a wood mulch or organic matter around trees, small fruits, and plants to reduce water evaporation from the soil. Avoid direct stem to mulch contact. Fruit trees and small berries may benefit from an early water now if soil conditions are dry. Early spring bulbs may also benefit from an early water if dry conditions are present.
- Lawns finish out the priority list. If watering the lawn, ensure that sprinklers are operating correctly and applying water to desired location. Make water applications so that water is applied deeply and infrequently. Increase the mowing height of the grass and consider mulching the clippings versus bag removal.
Resources:
- Watering a Home Landscape During Drought, Colorado State University Extension
- Watering Home Lawns and Landscapes, University of Idaho Extension
- Watering Home Lawns: How Much and How Often, University of Idaho Extension
2022 Rose & Grapevine Pruning
General Landscape and Garden Treasure Valley - Idaho
Posted on: March 25, 2022 by Nic Usabel
Across the Treasure Valley it’s time to prune grapevines and roses. See below for more resources for pruning these landscape & garden plants.
ROSES:
Rose pruning should occur when the buds are starting to swell in early spring. Below are a few resources that can be read or viewed for rose pruning.
- How to Prune Roses, Utah State University Extension video
- Early Spring Pruning of Roses, University of Maryland Extension video
- Guide to Pruning Roses, University of Maryland Extension
- Pruning Roses, Colorado State University
GRAPEVINES:
The University of Idaho Research & Extension Center in Parma recommends pruning grapevines in the Treasure Valley no sooner than mid-March to ensure that low temperatures do not kill buds after pruning. Grapevines can “bleed”, movement of sap from the cut, heavily when pruned in spring. This does not harm the vines. Below are a few resources that can be read or viewed for grape pruning.
- Grape Pruning Four Cane System, Utah State University Extension video
- Grape Pruning, USU Garden Guys & Gal video
- Pruning Grapevines, University of Nebraska Lincoln Extension video
- Yard and Garden: How to Prune Grapevines, Iowa State University
- Grape Vine Management, Utah State University Extension
- Grape Trellising and Training Basics, Utah State University Extension
2022 Spring Lawn Fertilization & Care
General Landscape and Garden Treasure Valley - Idaho
Posted on: March 22, 2022 by Nic Usabel
Spring lawn fertilization for cool season grasses recommend that fertilization be made while energy is being directed to root growth, which is followed by leaf growth. This timeframe for cool season turf in the Treasure Valley traditionally March thru early May. If mulching is a practice in your lawn maintenance plan, nitrogen can be reduced by ½ pound annually.
The proper rate of fertilizer application is best achieved when using a soil test result to identify the fertilizer needs of the soil. UI Extension publication Using Soil Test Results for Garden Fertilization will help guide the steps. Applications should be split between spring and fall. Application rates should not exceed 1 pound of nitrogen per 1,000 square feet in any one application, access Southern Idaho Lawns Fertilizer Guide to identify additional time(s) for application if rate would exceed the 1 pound of nitrogen per 1,000 square feet limit with only and spring and fall application. Always follow label directions.
For more information on how to obtain a soil sample to a soil test submission contact your local University of Idaho Extension office.
Another method of identifying application rate is based on the level of turf maintenance from low to high traffic. Application rates should not exceed 1 pound of nitrogen per 1,000 square feet in any fertilizer application and always follow label directions. Review descriptions, timing, and rate of application below.
- Light use: Classified as occasional foot traffic or little to no play from children. Annual turfgrass recommendation is 0-1 pound of nitrogen per 1,000 square feet. Split the application between a spring and fall application.
- Moderate Use: Typical children’s play and occasional garden parties. Annual turfgrass recommendation is 2-3 pounds of nitrogen per 1,000 square feet. Split the application equally between a spring, early fall (late September) and late fall (Mid October to Late November)
- Heavy Use: Frequently used sports field play, heavy traffic and/or frequent garden parties. Annual turfgrass recommendation is 4-6 pounds of nitrogen per 1,000 square feet. Apply 1 pound of nitrogen per 1,000 square feet in spring, 0.5 pound of nitrogen per 1,000 square feet late May/early June, 0.5 pound of nitrogen per 1,000 square feet late June/early July, 1 pound of nitrogen per 1,000 square feet early fall (late September) and 1 pound of nitrogen per 1,000 square feet late fall (Mid October to Late November).
If your lawn is suffering from soil compaction or development of a thick thatch layer core aeration can be completed in the spring but is preferred in fall while weed pressure will be reduced. For more information visit UI Extension publication Core Aeration of Lawns-Benefits & Procedures.
Spring provides the opportunity to seed new turfgrass areas or to over-seed areas that may have been damaged over the winter. Cool temperatures will promote germination and growth of cool season turf species, tall and fine fescues, perennial ryegrass, and Kentucky bluegrass. Weed pressure can be higher during the spring as compared to the fall when seeding or over-seeding.
If there are additional questions on lawn care or weed management reach out to a local University of Idaho Extension office.
2022 Delayed-Dormant Oil Application
General Landscape and Garden Treasure Valley - Idaho
Posted on: February 27, 2022 by Nic Usabel
In the coming weeks areas across the Treasure Valley could reach temperatures desirable for applying a delayed-dormant oil spray. The use of horticultural oil as a delayed-dormant spray can target many insect pests at a time when beneficial insects are not yet active. Use of the term “delayed-dormant” indicates that the oil should be applied after bud swell. This timeframe coincides with the increasing activity of the overwintering insect stages, such as aphid eggs, scale nymphs, and peach twig borer larvae.
The two factors of temperature and bud stage must correspond before application of horticultural oil is made.
TEMPERATURE:
Only apply oil if temperatures remain above freezing (ideal is above 40°F) for 24 hours after application and on a clear, non-windy day in the 50 to 70°F temperature range.
BUD STAGE:
The window of application extends from bud swell to when the leaves just start emerging. The last point you can safely apply oil based on fruit tree crop are:
- Apple: Half-inch green, but ideal application at green tip stage.
- Pear: Cluster bud.
- Cherry: White bud.
- Peach/nectarine: pre-bloom.
Refer to the Critical Temperatures for Frost Damage on Fruit Trees by Utah State University to view images of each bud stage mentioned.
Oil should be applied at a rate of 2% (5 Tbs in 1 gallon water) and thoroughly cover all cracks and crevices.
If aphids and scale have been a serious problem in previous years an insecticide could be added, see Chemical Control of Landscape Pests for chemical products available by pest. Read and follow label instructions for preparation and application.
If fire blight was an issue in the previous year add in a copper product for fire blight.
If you have additional questions, contact your localUniversity of Idaho Extension office.
Additional Resource:
2022 Pruning Deciduous Trees & Shrubs
General Landscape and Garden Treasure Valley
Posted on: January 25, 2022 by Nic Usabel
The dormant season is a great time to prune deciduous trees (landscape & fruit) and shrubs. It is not recommended to prune grapevines at this time. As a general guide remove no more than one-third of the tree when pruning. Below are a few resources on how to prune.
- Training Young Shade Trees, University of Idaho
- Pruning Deciduous Shade Trees, University of Arizona
- Pruning Deciduous Trees, University of New Hampshire
- Deciduous Fruit Tree Pruning Videos, University of Arizona
- How to Prune Trees Video, Colorado State University
Prune shrub species which grow on the current season’s growth during the dormant period, usually late winter early spring. A few examples of flowering shrubs in this grouping including butterfly bush, heather, heavenly bamboo, hydrangea, shrubby roses and rose of sharon. Reference the third link for more information.
For shrub species which form buds on last season’s growth prune these species within about two months after the flowers fade. On these species, flower buds form in late summer and early fall. Winter pruning decreases the number of flowers the following spring as branches containing flower buds are removed. A few examples of flowering shrubs in this grouping include azaleas, lilac, magnolia, mockorange, serviceberry, and witchhazel. Reference Pruning Ornamental Trees & Shrubs, from Purdue University.
For most areas of Idaho, plants that bloom before June 1 formed the flowers the previous year on old wood. Those that bloom after June 1 form flowers on new growth. Keep in mind that this is rough guideline.
The City of Nampa Parks & Forestry Department will offer tree pruning classes. See the attached file Horticulture Workshops for more details.
If you have additional questions, contact your local UI Extension office. To search by county visit https://www.uidaho.edu/extension/directory/counties
2022 Pre-License Training for Ornamental Pesticide Applicators
All Crops All Locations
Posted on: December 20, 2021 by Nic Usabel & Kimberly Tate
The UI Extension Pesticide Safety Education Program will be offering pre-license training during the 2022 Idaho Horticulture Expo in Boise. This training will be in-person with a two-day agenda. Focus will be on the following categories: Ornamental Insecticide (OI), Ornamental Herbicide (OH), General Pest (GP), and Core (CO).
Registration includes access to eLearning modules and study materials housed on the National Extension Foundation website. These materials prepare students for the 2-day class and the statewide exams. ALL materials will be available to each registered student with continued access until three weeks after the training. January 20 – 21, 2022, daily at 9am – 4pm MST (limit 45 students) Boise Centre, 850 W Front St., Boise 83702
This educational training is funded through an ISDA grant. There will be no cost to the student. COVID-19 restrictions will be determined by the instructors. Registered students will be notified of the current guidelines. To register, visit our website https://www.uidaho.edu/extension/ipm
For questions contact:
- Ronda Hirnyck | rhirnyck@uidaho.edu | 208-364-4046
- Kimberly Tate | ktate@uidaho.edu | 208-364-4581
2022 Idaho Horticulture Expo
General Landscape and Garden Treasure Valley
Posted on: December 15, 2021 by Nic Usabel
The Idaho Nursery and Landscape Association will host the Idaho Horticulture Expo January 19-20 at the Boise Center.
Here is a peak at just some speakers:
- Stepahnie Adams, Morton Arboretum
- Amanda Thompsen, author of Kiss My Aster
- Tim Prather, University of Idaho
- Dr. Brent Bean, BYU Idaho
- See the full schedule
Credits available:
- 11 continuing education credits for Arborists.
- 11 recertification credits for Pesticide Applicators
Register today at inlagrow.org.
2021 Live Evergreen Trees as Indoor Holiday Decoration
General Landscape and Garden Treasure Valley
Posted on: December 10, 2021 by Nic Usabel
If using a live, with roots attached, evergreen tree for your indoor holiday decoration here are some items to consider.
First, consider where in the landscape you will plant your tree. Select an open area which lacks overhanging tree branches or wires. If you don't have such a site, consider a dwarf conifer or evergreen shrub. Choose a tree that will thrive in your soil condition and climatic condition. Proper planning now will save you time and money later.
When you visit a nursery or garden center, you will find a variety of evergreens to choose from. Evergreens are commonly available as containerized trees grown in a pot or balled and burlapped trees.
Before the ground freezes, dig a hole 2-3 times wider than the root ball, but only as deep as the root ball itself. The soil which is removed from the hole will need to be stored where it will not freeze. This soil will be used in planting the tree after the holiday.
Trees have a better chance of survival if they are not displayed in the house for more than a 7 to 10 days. If purchasing the tree early keep the tree in a cool location before moving it indoors and water as necessary. Extended exposure to the indoor temperatures can counteract the winter dormancy in conifers. A short display period and prompt planting is the best way to insure the survival of the tree in the landscape.
When you are ready to plant position and level the tree. If the root ball is wrapped remove any cover or wires. Inspect the tree root ball for circling roots and straighten, cut, or remove them. Identify the trunk flare, where the trunk widens near the root zone, and ensure that the root flare is viable at ground level once planted. With the reserved soil fill the hole and gently but firmly apply pressure. Water thoroughly and apply a woodchip mulch. For more detailed planting instructions of trees visit treesaregood.org.
With appropriate care, planting, and management you will be able to enjoy your tree in the landscape for years to come.
Resources:
Selection and Care of Living Christmas Trees, NC State Extension
2021 Protecting Trees from Sunscald
General Landscape and Garden Treasure Valley
Posted on: November 19, 2021 by Nic Usabel
Sunscald or southwest winter injury happens during the winter. Intense direct and reflected sunlight will activate tissues under the bark. At night, temperatures fall, and cells freeze, causing cell death. This damage is often not noticed for a few years until the bark has split open exposing the damage below. The damaged sites are prone to attack by wood-boring insects and fungal pathogens.
Recently planted trees, young trees, and trees with thin bark are more susceptible to sunscald. Trees species which are susceptible include maple, linden, mountain-ash, honeylocust, birch, walnut, crabapple, flowering cherry, fruit trees, aspen, ash, tuliptree, and willow.
To prevent sunscald damage from occurring keep the lower trunk insulated or shaded in winter. Susceptible trees can be protected by wrapping the trunk with paper tree wrap, overlapping about 33% with each turn. Wrap trunks upward from the base of the tree to a point just above the lowest branch. Wrap should be removed in early spring after the risk of a hard frost has passed. If not removed the wraps can harbor insects and disease. Trunks can also be protected by placing a light-colored board to the south and west of the tree trunk. In large applications white latex paint can be diluted 1:1 with water and applied on the southwest side of the lower trunk. Landscape design and planting susceptible trees to the north and east of buildings or evergreens can help to shade the lower trunk.
References:
2021 Fall Control for Coryneum Blight & Peach Leaf Curl
General Landscape and Garden Treasure Valley
Coryneum blight (Thyrostroma carpophilum) & Peach leaf curl (Taphrina deformans)
Posted on: November 1, 2021 by Nic Usabel
Coryneum blight or commonly known as shothole disease which is caused by fungus Thyrostroma carpophilum. Trees which have been affected develop small, round, tan-to-purpleish spots which then dry and fall out of the leaf producing a shothole effect. Most cultivars of peach, nectarine, apricot, and almond are very susceptible while cherry and plum are less susceptible. In addition, ornamental plant species can show damage. Beyond the leaf, symptoms can also be seen on the current season and 1-year old fruiting wood. Infections consist of round, reddish spots which are slightly sunken.
Chemical control will occur after 50% leaf drop in late autumn by spraying with a copper-based fungicide, chlorothalonil, or Bordeaux mixture. Follow the label instructions for rate and application procedure. Prune out affected twigs when practical. Culturally control shothole disease by not allowing irrigation sprinklers to wet the tree foliage, select cultivars which are disease resistant when available, and remove and dispose of affected foliage and twigs.
Peach leaf curl caused by fungus Taphrina deformans and is specific to peaches and nectarines. Trees that are infected will have leaves that are distorted or curl, appear blistered, and develop a yellow or red color.
Control can be achieved by a single fungicide application in the fall after 90% of the leaves have fallen. Chemicals used for control are copper products or chlorothalonil. Follow the label instructions for rate and application procedure. Homeowners should also remove and dispose of infected leaves that have fallen to the ground, to remove as much inoculum as possible. Resistant varieties can be selected for additional cultural control.
References:
- Peach Leaf Curl, PNW Handbook
- Peach Leaf Curl Disease, Utah State University
- Shothole-Peach, PNW Handbook
- Shothole, UC IPM
Voles - Your Mortal Enemies!
All Crops Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho
Voles
Posted on: November 13, 2024 by Jeff Miller
Jason Thomas, University of Idaho Extension Educator, is working to better understand the impact of vole damage on Idaho farms and gather insights on how farmers like you have been affected. This information is crucial for helping us advocate for resources and support to address this issue effectively.
Please complete the 5-minute survey by clicking the link below, calling the Minidoka County Extension office at 208-436-7184 to do so over the phone or if you prefer to fill out a physical survey please email jasont@uidaho.edu with your address so he can send one out to you.
Thank you in advance for your valuable input—it makes a big difference!
https://uidaho.co1.qualtrics.
» https://uidaho.co1.qualtrics.com/jfe/form/SV_6KKoB4cTSn6p1Yy
TREASURE VALLEY PESTICIDE PRE-CERTIFICATION TRAINING
All Crops Treasure Valley, Treasure Valley - Idaho
Posted on: November 1, 2024 by Jemila Chellappa
Prepare for Your Idaho Pesticide License Exam!
Join us in person on November 8 from 8:00 am to noon at the University of Idaho Research and Extension Center for a comprehensive training program designed to help you and your team get ready for the Idaho State Department of Agriculture (ISDA) pesticide exams.
Date/Time: Friday, November 8, 8:00am - Noon
Location: UI Caldwell R & E Classroom 1904 E. Chicago St., Caldwell
Register: Call UI Extension, Canyon County 208-459-6003
What is included:
- Education on Idaho State pesticide regulations
- Training on how to effectively read and interpret pesticide labels
- Review exam preparation strategies
- Exclusive access to online practice modules and exams!
Cost: $15.00 per participant https://bit.ly/24PesTraining
This training provides an interactive way to engage with study materials, gain critical knowledge, and benefit from examples and discussions that reinforce key concepts. There will be plenty of opportunities for review and Q&A.
Special Offer:
Get free access to our online course, which includes additional resources and practice exams to help you prepare at your own pace!
Questions? Contact
canyon@uidaho.edu / 208-459-6003
The University of Idaho has a policy of nondiscrimination on the basis of race, color, religion, national origin, sex, age, sexual orientation, gender identity/expression, disability, genetic information, or status as any protected veteran or military status. Persons with disabilities who require alternative means for communication or program information or reasonable accommodations need to contact University of Idaho Extension Canyon County one (1) week prior at 501 Main St., Caldwell, 208-459-6003 or canyon@uidaho.edu.
Pesticide Applicator Recertification Seminar
All Crops All Locations
Posted on: November 1, 2024 by Jeff Miller
The University of Idaho is hosting the Pesticide Applicator Recertification Seminar on December 4 in Burley (Burley Best Western) and on December 5 in Twin Falls (Herrett Center, CSI).
Morning session: registration begins at 7:45 and the program runs from 8:30 to 12:00 pm (3 credits).
Afternoon session: registration at 12:30 and the program runs from 1:00 to 4:30 pm (3 credits).
The cost to attend is $35 (cash, card, or check) whether you attend the whole or half day.
Contact Linsy at the Jerome Extension office (208-324-7578, lin...@uidaho.edu) to RSVP.
Topics include:
Management of Russian Olive
Managing vole infestations in agriculture
Pesticide safety: Best practices for applicators
Environmental impacts of pesticides
Impacts of pesticide overuse
Beneficial insects for pest management
Manure and weed seeds
Pasture and range plants that endanger livestock
ISDA pesticide applicator program updates
Top applicator violations in Idaho
Tricounty/Cassia County weed control programs
Increasing efficiency of applications and reducing overapplication
2024 Idaho Association of Plant Protection Annual Meeting
All Crops All Locations
Posted on: October 11, 2024 by Jeff Miller
All are invited to the 2024 annual meeting of the Idaho Association of Plant Protection November 6-7 at the Herrett Center in Twin Falls! The cost to attend is $30 ($20 for students). Wed. credits = 2 ISDA, 4 CCA IPM. Thurs. credits = 2 ISDA, 3.5 CCA IPM. The agenda is attached and more information can be found at: https://millerresearch.com/event/2024-idaho-association-of-plant-protection/
» https://millerresearch.com/event/2024-idaho-association-of-plant-protection/
2024 ISDA Pesticide Disposal Program
All Crops All Locations
Posted on: August 24, 2024 by Jeff Miller
From the ISDA website:
Homeowners, growers, dealers, and professional applicators storing unusable or unwanted pesticides will have a safe and free opportunity to dispose of them at an ISDA pesticide disposal site.
ISDA pesticide disposal sites will take most pesticides including herbicides, insecticides, fungicides, rodenticides or anything ending with “cide.” No high-pressure canisters, fertilizer, micronutrients, paint, solvents, motor oil, or rinsates other than seed treat rinsates will be accepted. Loads exceeding 1,000 pounds must be pre-registered.
- Idaho Falls / Bonneville County Transfer Station – August 27th 9:00 a.m. to 1:00 p.m.
2455 Hemmert Ave, Idaho Falls, ID 83401 - Twin Falls / Twin Falls County Highway District – August 28th 9:00 a.m. to 1:00 p.m.
3208 E 3700 N, Twin Falls, ID 83301 - American Falls / Power County Transfer Station – Sept. 10th 9:00 a.m. to 1:00 p.m.
2950 Landfill Rd, American Falls, ID 83211 - Burley / Bureau of Land Management Field Office – Sept. 11th 9:00 a.m. to 1:00 p.m.
3630 Overland Rd, Burley, ID 83318
More information can be found at the ISDA website.
» https://agri.idaho.gov/pesticides/pesticide-disposal-program/
Parma Field Day 2024
All Crops Treasure Valley, Treasure Valley - Idaho
Posted on: July 12, 2024 by Jemila Chellappa
PARMA RESEARCH AND EXTENSION FIELD DAY
2 Idaho and 3 Oregon pesticide credits available
Date and Time: Thursday, August 8th, 2024 @ 7:15 am – 11:30 am
To cover field research on crops including onions, beans, sugar beets, hops, potatoes, corn, and carrots. To include demonstrations involving varieties, plant disease management, nematology, insect pests, and more. Idaho and Oregon pesticide education credits are expected to be offered.
Venue: University of Idaho Parma Research and Extension Center,
29603 U of I Lane, Parma, ID 83660
Schedule:
o 7.15 am: Registration, breakfast, posters, and displays
o 8 am – 11.30 am: Field tours and presentations
All are welcome!
No need to pre-register.
For further information
Contact: James Woodhall (jwoodhall@uidaho.edu)
Cercospora Leaf Spot in Sugarbeet
Sugarbeets All Locations
Cercospor Leaf Spot
Posted on: July 12, 2024 by Oliver Never
Sugarbeets - Treasure Valley, Western Magic Valley
University of Idaho and Amalgamated Sugar Company personnel have identified Cercospora leaf spot in fields near Parma ID, Wilder ID, and Glenns Ferry ID. Incidence is still low, however, most fields have closed rows, Cercospora spores have been detected in spore traps deployed in the Treasure Valley, and environmental conditions have been conducive for infection for a couple of weeks now.
If fungicide applications have not yet occurred, we strongly encourage everyone to start spraying against Cercospora leaf spot.
Several fungicides are available but be aware of multiple fungicide-resistant strains of Cercospora. Depending on the disease pressure and chemistry used, applications with different chemistries should be repeated every 14 days. Using a protectant such as copper products, EBDCs, or hydrogen peroxide with every spray is strongly recommended.[https://www.srcoop.com/articles/2024_Fungicide_Recommendations.pdf ]
Contact your crop consultant from the Amalgamated Sugar Company to discuss suitable fungicides for your area, to report a loss of fungicide efficacy, or if you have any questions.
Click on the link below for the Cercospora leaf spot pages in the PNW Plant Disease Management Handbooks.
https://pnwhandbooks.org/plantdisease/host-disease/sugar-beet-beta-vulgaris-cercospora-leaf-spot
Cercospora Leaf Spot in Sugarbeet - 2024
Sugarbeets Treasure Valley, Treasure Valley - Idaho, Magic Valley
Cercospora Leaf Spot
Posted on: July 7, 2024 by Oliver Neher
Sugarbeets- Treasure Valley, Western Magic Valley
University of Idaho and Amalgamated Sugar Company personnel have identified Cercospora leaf spot in fields near Parma ID, Wilder ID, and Glenns Ferry ID. Incidence is stilllow, however, most fields have closed rows, Cercospora spores have been detected in spore traps deployed in the Treasure Valley, and environmental conditions have been conducive for infection for a couple of weeks now.
In case fungicide applications have not yet occurred, we are strongly encouraging everyone to start spraying against Cercospora leaf spot. There are several fungicides available [https://www.srcoop.com/articles/2024_Fungicide_Recommendations.pdf ] but be aware of multiple fungicide resistant strains of Cercospora. Depending on the disease pressure and chemistry used, applications with different chemistries should be repeated every 14 days. The use of a protectant such as copper products, EBDCs, or hydrogen peroxide with every spray is strongly recommended.
Contact your crop consultant from the Amalgamated Sugar Company to discuss suitable fungicides for your area, to report a loss of fungicide efficacy, or if you have any questions.
Click on the link below for the Cercospora leaf spot pages in the PNW Plant Disease Management Handbooks.
https://pnwhandbooks.org/plantdisease/host-disease/sugar-beet-beta-vulgaris-cercospora-leaf-spot
Canyon County Emergency Management Storm Assessment
Announcements Treasure Valley
Posted on: June 28, 2024 by Jemila Chellappa
For anyone in the County who knows anyone who might have been affected by the storm a few days ago please see the information below and share it with your friends and family who might have been involved:
Canyon County Office of Emergency Management is trying to gather information from people who were affected by the microburst that came through our area on Tuesday, June 25, 2024. If your property or crops received any type of damage from the storm, please fill out this form.
Please send photos/attachments to the following email address with a description of the location and what was damaged. Email information to: emergencymanagement@canyoncounty.id.gov
Here is the link: https://forms.gle/BhxwVV4r27K8RLiq9
Pest Alert: Western cherry fruit fly in Idaho
Cherry All Locations
Western Cherry Fruit Fly
Posted on: June 10, 2024 by Jemila Chellappa
Crop: Cherry
Problem Description:
The first Western cherry fruit fly has been found in an Idaho State Department of Agriculture Western cherry fruit fly trap in Western Idaho. If treatment for the Western cherry fruit fly is not already underway, it should begin now.
Contact for further Information: vene.stewart@isda.idaho.gov
» https://pnwhandbooks.org/insect/tree-fruit/cherry/cherry-western-cherry-fruit-fly
2024 Ag Talk Tuesday sessions to resume
All Crops All Locations
General announcement - all crops
Posted on: April 4, 2024 by Kasia Duellman
The University of Idaho Ag Talk Tuesday sessions will resume once again in 2024. Join us for our 7th season of these live Zoom sessions held every first and third Tuesday, May through August. The sessions start at 11:00 AM (MDT) and typically conclude by Noon (MDT).
Registration is required to attend. The registration link is available on our website: https://www.uidaho.edu/ag-talk
During each Ag Talk Tuesday session, we invite contributions regarding timely information on crops in Idaho and the Pacific Northwest. These Crop Updates are then followed by a Featured Topic with Guest Speakers for deep dives into ag-related topics of interest.
Below is our current 2024 (Draft) Agenda for Featured Topics (subject to change):
- May 7: Water Update (Keith Esplin, Eastern Idaho Water Rights Coalition) and Ag Outlook (Josh Huff, Ag West Farm Credit)
- May 21: Soil arthropods and soil health: Belowground partners in PNW wheat systems (Dane Elquist and Sanford Eigenbrode*, University of Idaho) (*presenter)
- June 4: To be confirmed
- June 18: Family farms and corporate farms - what is the Idaho landscape? (Brett Wilder, University of Idaho)
- July 2: Entomology at Parma REC (Dr. Armando Falcon-Brindis, University of Idaho)
- July 16: Nematodes (Dr. Pooria Ensafi, University of Idaho)
- Aug 6: Annual alfalfa as a source of nitrogen for subsequent small grain crops (Reed Findlay*, Dr. Jared Spackman, Joseph Sagers, Justin Hatch, Tom Jacobsen, Jared Gibbons; University of Idaho) (*presenter)
- Aug 20: Idaho crop profitability outlook (Dr. Pat Hatzenbuehler, University of Idaho)
Looking forward to seeing you at Ag Talk Tuesday!
Sincerely,
Your Ag Talk Tuesday Organizers:
- Kasia Duellman (kduellman@uidaho.edu)
- Doug Finkelnburg (dougf@uidaho.edu)
- Pam Hutchinson (phutch@uidaho.edu)
- Juliet Marshall (jmarshall@uidaho.edu)
» https://www.uidaho.edu/ag-talk
Pesticide recertification seminars at the Western Idaho Ag Show
Announcements All Locations
Posted on: January 11, 2024 by Ronda Hirnyck
Six pesticide recertification credits offered at the Ag Show. Location: "The Center at the Fair", Canyon County Fairgrounds, Caldwell, ID.
WESTERN IDAHO AG SHOW –JANUARY 23-24, 2024
Pesticide Seminars for Recertification Credit
Day 1—January 23, 2023-Tuesday.
WESTERN IDAHO AG SHOW – JANUARY 24-25, 2023
Day 2 – January 24, 2024 --Wednesday
Job announcement - Farm Assistant II, UI Kimberly REC
All Crops All Locations
General announcement - all crops
Posted on: December 14, 2023 by Kasia Duellman
All:
The University of Idaho Kimberly Research & Extension Center is advertising a full-time position with benefits. Please forward to anyone who may be interested in applying.
This position will operate tractors and other field equipment, plant, fertilize, cultivate, spray, and harvest in support of research and non-research related crops. Perform routine maintenance on machinery and equipment. Irrigate some weekends. Perform backup facilities maintenance at the Kimberly R&E Center. Contribute to team effort by creating a work environment that emphasizes teamwork and safety.
Here is the link to the position: https://uidaho.peopleadmin.com/postings/43031
» https://uidaho.peopleadmin.com/postings/43031
Need Pesticide Credits for 2023?
Announcements All Locations
Posted on: November 7, 2023 by Kimberly Tate
Enroll in the University of Idaho (UI) Extension Pesticide Safety Education Program (PSEP) for the 2023 Fall Recertification Webinar Series (held via Zoom; no camera/no account required). Attend for $10 per applicator/per webinar. Completed webinar(s) receive one Idaho State Department of Agriculture pesticide credit(s)*. Note: ALL webinars are held at Mountain Time (MT).
- Nov. 14 from 2–3 p.m. (MT) — Ronda Hirnyck: Changes to pesticide regulations; What the applicator needs to know!
- Nov. 21 from 2–3 p.m. (MT) — Doug Finkelnburg: Avoiding herbicide residual issues in cropping systems
- Nov. 28 from 2–3 p.m. (MT) — Albert Adjesiwor, Ph.D.: Palmer Amaranth and Waterhemp, the Troublesome Pigweeds: Identification, early detection, and rapid response
- Dec. 5 from 2–3 p.m. (MT) — Ariel Agenbroad: Assessing beneficial insect habitat on your farm or property
- Dec. 12 from 2–3 p.m. (MT) — Tom Jacobsen: Minimizing pesticide resistance
- Dec. 19 from 2–3 p.m. (MT) — Brad Stokes: Overview of invasive organisms in Idaho and their treatment options
Registration will close at noon (MT) on the day of the webinar.
*For pesticide credit: Pesticide applicators must answer questions within the webinar session. This requires individual computer and internet access for each user. Answers will be collected to confirm attendance was maintained for the entire webinar. The Zoom platform does not recognize multiple users connected with the same email address. Be sure to utilize different identifying information.
Register Today: https://marketplace.uidaho.edu/C20272_ustores/web/store_main.jsp?STOREID=53&SINGLESTORE=true
Need more information? Contact Kimberly Tate, UI Extension Pest Management Instructor by phone (208) 364-4581 or email ktate@uidaho.edu.
» https://www.uidaho.edu/extension/ipm/pesticide
» 2023-PSEP-Fall-Recertification_Poster.pdf
2022 Extension Drought Resources
General Landscape and Garden Treasure Valley
Posted on: April 24, 2022 by Nic Usabel
If you are looking for ways to conserve water during this growing season here are a number or resources available from various Extension programs.
- University of Idaho Extension Drought Resources
- Utah State University Extension Drought Resources
- Watering a Home Landscape During a Drought, Colorado State University
- Native Plant Landscaping: Curb Appeal and Low Water Use, University of Idaho
- Landscaping with Native Plants, University of Idaho
- Idaho Climate & Weather Resources, University of Idaho
- U.S. Drought Monitor for Idaho, National Drought Mitigation Center
For additional questions reach out to a local Extension office. Find a local University of Idaho Extension Office.
2022 Dry Spring Conditions
General Landscape and Garden Treasure Valley - Idaho
Posted on: March 25, 2022 by Nic Usabel
Much of Idaho has experienced below average precipitation this past winter and it continues into early spring. The Treasure Valley is no different. During periods with low water resources, it is important to prioritize watering needs. While some lawn conditions appear dry it is not yet time to begin the watering of residential lawns. Consider the following as a prioritization to follow during times of low water resources:
- Young or newly transplanted trees which have a limited root system. Ensure to proper application of water and water deeply and infrequently based on soil texture.
- Established trees and shrubs should also be given consideration to priority watering as established plants are high value and take many years to replace. When applying water to trees and shrubs apply at an appropriate rate that allows water to soak into the soil to a depth of 12 inches. Frequency of water depends on soil texture and if water restrictions are in place. General guides are as follows: April once per month, May through September up to twice per month.
- Fruit gardens, vegetables gardens, and flowers are generally next on the list of prioritizations. Consider using a wood mulch or organic matter around trees, small fruits, and plants to reduce water evaporation from the soil. Avoid direct stem to mulch contact. Fruit trees and small berries may benefit from an early water now if soil conditions are dry. Early spring bulbs may also benefit from an early water if dry conditions are present.
- Lawns finish out the priority list. If watering the lawn, ensure that sprinklers are operating correctly and applying water to desired location. Make water applications so that water is applied deeply and infrequently. Increase the mowing height of the grass and consider mulching the clippings versus bag removal.
Resources:
- Watering a Home Landscape During Drought, Colorado State University Extension
- Watering Home Lawns and Landscapes, University of Idaho Extension
- Watering Home Lawns: How Much and How Often, University of Idaho Extension
» Idaho SNOTEL Current Snow Water Equivalent
2022 Rose & Grapevine Pruning
General Landscape and Garden Treasure Valley - Idaho
Posted on: March 25, 2022 by Nic Usabel
Across the Treasure Valley it’s time to prune grapevines and roses. See below for more resources for pruning these landscape & garden plants.
ROSES:
Rose pruning should occur when the buds are starting to swell in early spring. Below are a few resources that can be read or viewed for rose pruning.
- How to Prune Roses, Utah State University Extension video
- Early Spring Pruning of Roses, University of Maryland Extension video
- Guide to Pruning Roses, University of Maryland Extension
- Pruning Roses, Colorado State University
GRAPEVINES:
The University of Idaho Research & Extension Center in Parma recommends pruning grapevines in the Treasure Valley no sooner than mid-March to ensure that low temperatures do not kill buds after pruning. Grapevines can “bleed”, movement of sap from the cut, heavily when pruned in spring. This does not harm the vines. Below are a few resources that can be read or viewed for grape pruning.
- Grape Pruning Four Cane System, Utah State University Extension video
- Grape Pruning, USU Garden Guys & Gal video
- Pruning Grapevines, University of Nebraska Lincoln Extension video
- Yard and Garden: How to Prune Grapevines, Iowa State University
- Grape Vine Management, Utah State University Extension
- Grape Trellising and Training Basics, Utah State University Extension
2022 Spring Lawn Fertilization & Care
General Landscape and Garden Treasure Valley - Idaho
Posted on: March 22, 2022 by Nic Usabel
Spring lawn fertilization for cool season grasses recommend that fertilization be made while energy is being directed to root growth, which is followed by leaf growth. This timeframe for cool season turf in the Treasure Valley traditionally March thru early May. If mulching is a practice in your lawn maintenance plan, nitrogen can be reduced by ½ pound annually.
The proper rate of fertilizer application is best achieved when using a soil test result to identify the fertilizer needs of the soil. UI Extension publication Using Soil Test Results for Garden Fertilization will help guide the steps. Applications should be split between spring and fall. Application rates should not exceed 1 pound of nitrogen per 1,000 square feet in any one application, access Southern Idaho Lawns Fertilizer Guide to identify additional time(s) for application if rate would exceed the 1 pound of nitrogen per 1,000 square feet limit with only and spring and fall application. Always follow label directions.
For more information on how to obtain a soil sample to a soil test submission contact your local University of Idaho Extension office.
Another method of identifying application rate is based on the level of turf maintenance from low to high traffic. Application rates should not exceed 1 pound of nitrogen per 1,000 square feet in any fertilizer application and always follow label directions. Review descriptions, timing, and rate of application below.
- Light use: Classified as occasional foot traffic or little to no play from children. Annual turfgrass recommendation is 0-1 pound of nitrogen per 1,000 square feet. Split the application between a spring and fall application.
- Moderate Use: Typical children’s play and occasional garden parties. Annual turfgrass recommendation is 2-3 pounds of nitrogen per 1,000 square feet. Split the application equally between a spring, early fall (late September) and late fall (Mid October to Late November)
- Heavy Use: Frequently used sports field play, heavy traffic and/or frequent garden parties. Annual turfgrass recommendation is 4-6 pounds of nitrogen per 1,000 square feet. Apply 1 pound of nitrogen per 1,000 square feet in spring, 0.5 pound of nitrogen per 1,000 square feet late May/early June, 0.5 pound of nitrogen per 1,000 square feet late June/early July, 1 pound of nitrogen per 1,000 square feet early fall (late September) and 1 pound of nitrogen per 1,000 square feet late fall (Mid October to Late November).
If your lawn is suffering from soil compaction or development of a thick thatch layer core aeration can be completed in the spring but is preferred in fall while weed pressure will be reduced. For more information visit UI Extension publication Core Aeration of Lawns-Benefits & Procedures.
Spring provides the opportunity to seed new turfgrass areas or to over-seed areas that may have been damaged over the winter. Cool temperatures will promote germination and growth of cool season turf species, tall and fine fescues, perennial ryegrass, and Kentucky bluegrass. Weed pressure can be higher during the spring as compared to the fall when seeding or over-seeding.
If there are additional questions on lawn care or weed management reach out to a local University of Idaho Extension office.
2022 Delayed-Dormant Oil Application
General Landscape and Garden Treasure Valley - Idaho
Posted on: February 27, 2022 by Nic Usabel
In the coming weeks areas across the Treasure Valley could reach temperatures desirable for applying a delayed-dormant oil spray. The use of horticultural oil as a delayed-dormant spray can target many insect pests at a time when beneficial insects are not yet active. Use of the term “delayed-dormant” indicates that the oil should be applied after bud swell. This timeframe coincides with the increasing activity of the overwintering insect stages, such as aphid eggs, scale nymphs, and peach twig borer larvae.
The two factors of temperature and bud stage must correspond before application of horticultural oil is made.
TEMPERATURE:
Only apply oil if temperatures remain above freezing (ideal is above 40°F) for 24 hours after application and on a clear, non-windy day in the 50 to 70°F temperature range.
BUD STAGE:
The window of application extends from bud swell to when the leaves just start emerging. The last point you can safely apply oil based on fruit tree crop are:
- Apple: Half-inch green, but ideal application at green tip stage.
- Pear: Cluster bud.
- Cherry: White bud.
- Peach/nectarine: pre-bloom.
Refer to the Critical Temperatures for Frost Damage on Fruit Trees by Utah State University to view images of each bud stage mentioned.
Oil should be applied at a rate of 2% (5 Tbs in 1 gallon water) and thoroughly cover all cracks and crevices.
If aphids and scale have been a serious problem in previous years an insecticide could be added, see Chemical Control of Landscape Pests for chemical products available by pest. Read and follow label instructions for preparation and application.
If fire blight was an issue in the previous year add in a copper product for fire blight.
If you have additional questions, contact your localUniversity of Idaho Extension office.
Additional Resource:
2022 Pruning Deciduous Trees & Shrubs
General Landscape and Garden Treasure Valley
Posted on: January 25, 2022 by Nic Usabel
The dormant season is a great time to prune deciduous trees (landscape & fruit) and shrubs. It is not recommended to prune grapevines at this time. As a general guide remove no more than one-third of the tree when pruning. Below are a few resources on how to prune.
- Training Young Shade Trees, University of Idaho
- Pruning Deciduous Shade Trees, University of Arizona
- Pruning Deciduous Trees, University of New Hampshire
- Deciduous Fruit Tree Pruning Videos, University of Arizona
- How to Prune Trees Video, Colorado State University
Prune shrub species which grow on the current season’s growth during the dormant period, usually late winter early spring. A few examples of flowering shrubs in this grouping including butterfly bush, heather, heavenly bamboo, hydrangea, shrubby roses and rose of sharon. Reference the third link for more information.
For shrub species which form buds on last season’s growth prune these species within about two months after the flowers fade. On these species, flower buds form in late summer and early fall. Winter pruning decreases the number of flowers the following spring as branches containing flower buds are removed. A few examples of flowering shrubs in this grouping include azaleas, lilac, magnolia, mockorange, serviceberry, and witchhazel. Reference Pruning Ornamental Trees & Shrubs, from Purdue University.
For most areas of Idaho, plants that bloom before June 1 formed the flowers the previous year on old wood. Those that bloom after June 1 form flowers on new growth. Keep in mind that this is rough guideline.
The City of Nampa Parks & Forestry Department will offer tree pruning classes. See the attached file Horticulture Workshops for more details.
If you have additional questions, contact your local UI Extension office. To search by county visit https://www.uidaho.edu/extension/directory/counties
2022 Pre-License Training for Ornamental Pesticide Applicators
All Crops All Locations
Posted on: December 20, 2021 by Nic Usabel & Kimberly Tate
The UI Extension Pesticide Safety Education Program will be offering pre-license training during the 2022 Idaho Horticulture Expo in Boise. This training will be in-person with a two-day agenda. Focus will be on the following categories: Ornamental Insecticide (OI), Ornamental Herbicide (OH), General Pest (GP), and Core (CO).
Registration includes access to eLearning modules and study materials housed on the National Extension Foundation website. These materials prepare students for the 2-day class and the statewide exams. ALL materials will be available to each registered student with continued access until three weeks after the training. January 20 – 21, 2022, daily at 9am – 4pm MST (limit 45 students) Boise Centre, 850 W Front St., Boise 83702
This educational training is funded through an ISDA grant. There will be no cost to the student. COVID-19 restrictions will be determined by the instructors. Registered students will be notified of the current guidelines. To register, visit our website https://www.uidaho.edu/extension/ipm
For questions contact:
- Ronda Hirnyck | rhirnyck@uidaho.edu | 208-364-4046
- Kimberly Tate | ktate@uidaho.edu | 208-364-4581
» 2021-PreLicense_URBAN-Training_POSTER.pdf
2022 Idaho Horticulture Expo
General Landscape and Garden Treasure Valley
Posted on: December 15, 2021 by Nic Usabel
The Idaho Nursery and Landscape Association will host the Idaho Horticulture Expo January 19-20 at the Boise Center.
Here is a peak at just some speakers:
- Stepahnie Adams, Morton Arboretum
- Amanda Thompsen, author of Kiss My Aster
- Tim Prather, University of Idaho
- Dr. Brent Bean, BYU Idaho
- See the full schedule
Credits available:
- 11 continuing education credits for Arborists.
- 11 recertification credits for Pesticide Applicators
Register today at inlagrow.org.
» https://inlagrow.org/event-4572799
2021 Live Evergreen Trees as Indoor Holiday Decoration
General Landscape and Garden Treasure Valley
Posted on: December 10, 2021 by Nic Usabel
If using a live, with roots attached, evergreen tree for your indoor holiday decoration here are some items to consider.
First, consider where in the landscape you will plant your tree. Select an open area which lacks overhanging tree branches or wires. If you don't have such a site, consider a dwarf conifer or evergreen shrub. Choose a tree that will thrive in your soil condition and climatic condition. Proper planning now will save you time and money later.
When you visit a nursery or garden center, you will find a variety of evergreens to choose from. Evergreens are commonly available as containerized trees grown in a pot or balled and burlapped trees.
Before the ground freezes, dig a hole 2-3 times wider than the root ball, but only as deep as the root ball itself. The soil which is removed from the hole will need to be stored where it will not freeze. This soil will be used in planting the tree after the holiday.
Trees have a better chance of survival if they are not displayed in the house for more than a 7 to 10 days. If purchasing the tree early keep the tree in a cool location before moving it indoors and water as necessary. Extended exposure to the indoor temperatures can counteract the winter dormancy in conifers. A short display period and prompt planting is the best way to insure the survival of the tree in the landscape.
When you are ready to plant position and level the tree. If the root ball is wrapped remove any cover or wires. Inspect the tree root ball for circling roots and straighten, cut, or remove them. Identify the trunk flare, where the trunk widens near the root zone, and ensure that the root flare is viable at ground level once planted. With the reserved soil fill the hole and gently but firmly apply pressure. Water thoroughly and apply a woodchip mulch. For more detailed planting instructions of trees visit treesaregood.org.
With appropriate care, planting, and management you will be able to enjoy your tree in the landscape for years to come.
Resources:
Selection and Care of Living Christmas Trees, NC State Extension
2021 Protecting Trees from Sunscald
General Landscape and Garden Treasure Valley
Posted on: November 19, 2021 by Nic Usabel
Sunscald or southwest winter injury happens during the winter. Intense direct and reflected sunlight will activate tissues under the bark. At night, temperatures fall, and cells freeze, causing cell death. This damage is often not noticed for a few years until the bark has split open exposing the damage below. The damaged sites are prone to attack by wood-boring insects and fungal pathogens.
Recently planted trees, young trees, and trees with thin bark are more susceptible to sunscald. Trees species which are susceptible include maple, linden, mountain-ash, honeylocust, birch, walnut, crabapple, flowering cherry, fruit trees, aspen, ash, tuliptree, and willow.
To prevent sunscald damage from occurring keep the lower trunk insulated or shaded in winter. Susceptible trees can be protected by wrapping the trunk with paper tree wrap, overlapping about 33% with each turn. Wrap trunks upward from the base of the tree to a point just above the lowest branch. Wrap should be removed in early spring after the risk of a hard frost has passed. If not removed the wraps can harbor insects and disease. Trunks can also be protected by placing a light-colored board to the south and west of the tree trunk. In large applications white latex paint can be diluted 1:1 with water and applied on the southwest side of the lower trunk. Landscape design and planting susceptible trees to the north and east of buildings or evergreens can help to shade the lower trunk.
References:
2021 Fall Control for Coryneum Blight & Peach Leaf Curl
General Landscape and Garden Treasure Valley
Coryneum blight (Thyrostroma carpophilum) & Peach leaf curl (Taphrina deformans)
Posted on: November 1, 2021 by Nic Usabel
Coryneum blight or commonly known as shothole disease which is caused by fungus Thyrostroma carpophilum. Trees which have been affected develop small, round, tan-to-purpleish spots which then dry and fall out of the leaf producing a shothole effect. Most cultivars of peach, nectarine, apricot, and almond are very susceptible while cherry and plum are less susceptible. In addition, ornamental plant species can show damage. Beyond the leaf, symptoms can also be seen on the current season and 1-year old fruiting wood. Infections consist of round, reddish spots which are slightly sunken.
Chemical control will occur after 50% leaf drop in late autumn by spraying with a copper-based fungicide, chlorothalonil, or Bordeaux mixture. Follow the label instructions for rate and application procedure. Prune out affected twigs when practical. Culturally control shothole disease by not allowing irrigation sprinklers to wet the tree foliage, select cultivars which are disease resistant when available, and remove and dispose of affected foliage and twigs.
Peach leaf curl caused by fungus Taphrina deformans and is specific to peaches and nectarines. Trees that are infected will have leaves that are distorted or curl, appear blistered, and develop a yellow or red color.
Control can be achieved by a single fungicide application in the fall after 90% of the leaves have fallen. Chemicals used for control are copper products or chlorothalonil. Follow the label instructions for rate and application procedure. Homeowners should also remove and dispose of infected leaves that have fallen to the ground, to remove as much inoculum as possible. Resistant varieties can be selected for additional cultural control.
References:
- Peach Leaf Curl, PNW Handbook
- Peach Leaf Curl Disease, Utah State University
- Shothole-Peach, PNW Handbook
- Shothole, UC IPM
» Peach Leaf Curl on Nectarine
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