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TASCO Field Days
Sugarbeets All Locations
Posted on: July 1, 2020 by Jerry Neufeld
The following announcement is from The Amalgamated Sugar Company.
Due to the raising rate of Covid community transmission, we see ourselves forced to cancel The Amalgamated Sugar Company Field Days in Nampa (July 7th) and Jerome (July 9th).
We apologize for the short notice and ask for your understanding.
Virtual Tour July 7th: UI Snake River Weed Mgt Tour - Aberdeen Research and Extension Center
All Crops All Locations
Posted on: June 29, 2020 by Pamela Hutchinson
Can not make it to the on-site Tour June 30th?
You are in luck!
You are invited to a virtual tour of the UI Snake River Weed Mgt trials: Aberdeen Research and Extension Center via Zoom meeting.
When: Jul 7, 2020 01:00 to 4 PM Mountain Time (US and Canada)
Even if you saw the trials up close and personal June 30 you can also register for this virtual tour.
NOTE: Three Pesticide Recertification credits will be offered for virtual tour attendees.
Register in advance for this meeting:
https://uidaho.zoom.us/meeting/register/tJYpdumtrjgpEtE7UlRaMInXN--XVoQ50nrN
After registering, you will receive a confirmation email containing information about joining the meeting.
Pam
Pamela J.S. Hutchinson
Potato Cropping Systems Weed Scientist
Aberdeen R&E Center
1693 S 2700 W
Aberdeen, ID 83210
Cell ph 208-681-1304
Office ph 397-4181 fax 397-4311
» https://uidaho.zoom.us/meeting/register/tJYpdumtrjgpEtE7UlRaMInXN--XVoQ50nrN
Additional resources for potato quality improvement are now available on-line
Potato All Locations
Posted on: June 29, 2020 by Nora Olsen and Mike Thornton
As part of the Idaho Potato Commission-funded quality project we have been working with one of the largest retailers of potatoes to monitor the incidence of defects seen at the consumer level in the 2017, 2018 and 2019 potato crops. The good news is that we have seen an improvement in the quality of potatoes delivered over the three years of the project. We believe that this improvement in quality is due in large part to the emphasis on reducing bruise damage being exhibited at both the grower and shipper levels.
One of the best ways to reduce bruise damage is to focus on training the people that operate every piece of potato handling equipment on their role in the effort to improve quality. To that end, we have developed several training resources on our website under the “Bruise Management” tab. In 2019 we focused on videos that show windrower and harvester operators the key factors in operating that equipment in a way that minimizes bruise. But we realize that bruising can take place any time potatoes are handled, so in 2020 we focused on the equipment that moves potatoes from the truck into storage, the piling operation, and the process of removing the potatoes from storage. The result is three new videos entitled Moving Potatoes from Truck to Piler, Best Practices for Piling Potatoes, and Unloading Potatoes Out of Storage. Each video is only 3 to 4 minutes long, but cover the basic operating principles and show several viewpoints so that equipment operators can see what the machinery should look like when operating properly.
Special thanks go to Jason Thomas (Minidoka County Extension Educator) for the narration, and Bill Schaefer for shooting the video and editing it all into the final product.
The initial videos are available in English. However, we anticipate that a Spanish version of the videos will be posted shortly. All these videos are available at the following website:
https://www.uidaho.edu/cals/potatoes/bruise-management/training-videos
Powdery Mildew in Sugarbeets - 2020
Sugarbeets All Locations
Powdery Mildew
Posted on: June 23, 2020 by Jerry Neufeld
Powdery mildew has been found by The Amalgamated Sugar Company LLC Crop Consultants in sugarbeet fields in the Nyssa, OR and Parma, ID area. This is quite a bit earlier than the past few years. There are several fungicides available for use to treat powdery mildew. Depending on the disease pressure and chemistry used, applications with different chemistries should be repeated every 14-21 days. Please be advised that strobilurins could show reduced efficacy to due fungicide resistance. Always tankmix with at least 5 lbs of sulfur for resistance management purposes. Contact your Crop Consultant from The Amalgamated Sugar Company LLC if you have any questions.
Click on the link below for the powdery mildew pages in the PNW Plant Disease Management Handbooks.
» https://pnwhandbooks.org/plantdisease/host-disease/sugar-beet-beta-vulgaris-powdery-mildew
2020 UI Snake River Pest Management Tour - Aberdeen
Announcements All Locations
Posted on: June 19, 2020 by Pamela Hutchinson
Hello!
We will definitely have our annual Snake River Pest Management Tour at the Aberdeen R&E Center Tuesday June 30th!
Time:
· Registration 8:30 to 9a
· Tour 9a to noon
Safety precautions:
· Forehead temperatures will be taken at registration..
· Face masks are required – we will provide if you don’t have one on tour day.
· Hand sanitizer will be available at registration and during the tour.
· Attendees must social distance except for within your family or within a group of members from your own company with whom you have been approved to be closer than 6ft.
· Attendees will drive their own vehicles to field tour stops rather than on trailers. The tour is entirely at the Aberdeen R&E Center.
· No lunch after the tour but bottled water will be provided throughout the morning.
Credits: Three Idaho pesticide applicator recertification credits will be offered.
FOR THOSE WHO CANNOT ATTEND IN PERSON:
We will have a virtual tour of some type – stay tuned for further details.
Featured will be several weed control trials in potatoes, including tank mixtures, planned vs. rescue postemergence applications, chemigation vs sprinkler incorporation as well as potato variety herbicide tolerance trials, and herbicide mechanism of action plots.
And…Updates about other pests and other crops from our Research and Extension project leaders.
Please forward this email to your colleagues.
NO RSVP needed unless you are unable to have a vehicle for the tour stops.
We hope to see you there!
Pam
Pamela J.S. Hutchinson
Potato Cropping Systems Weed Scientist
Aberdeen R&E Center
1693 S 2700 W
Aberdeen, ID 83210
Cell ph 208-681-1304
Office ph 397-4181 fax 397-4311
Cercospora leaf spot in Sugarbeets - 2020
Sugarbeets All Locations
Cercospora leaf spot
Posted on: June 15, 2020 by Jerry Neufeld
Amalgamated Sugar Company, LLC is reporting they have the first confirmed sighting of Cercospora leaf spot for 2020 in a sugarbeet field between Caldwell and Notus. A Senior Agriculturist with AMSCO found symptomatic leaves in an overhead irrigated field. We have reached critical temperatures but relative humidity is still low, however overhead irrigation can artificially increase relative humidity and therefore increase infection potential. Fields in close proximity to last year’s infected fields, or back to back sugarbeet fields are especially at risk. Please contact your local AMSCO agriculturist for fungicide recommendations based on last year’s fungicide resistance survey.
2020 Fruit Thinning
General Landscape and Garden Treasure Valley
Posted on: June 11, 2020 by Nic Usabel
Fruits which are crowded should be thinned. Apples, pears, Asian pears, apricots, plums, and peaches all respond positively to thinning. Cherries and nut trees are usually not thinned. Thinning fruit will 1) increase fruit size, 2) improve the trees productivity in the year to come, and 3) reduce limb breakage as fruits begin to size. Too many fruits on a tree translates into small fruit that is often of poor quality.
General rules for thinning: 1) The earlier the better, 2) remove smaller fruits and leave the larger ones, 3) remove fruits with disease spots, hail damage, or other defects, 4) aim for even spacing.
General guidelines by fruit – see links below for additional detail.
Apples & pears: Almost always need thinning. Should be thinned to one per spur with a good spacing of one fruit per 6” of branch. Asian pears spaced at one fruit per 6-8” of branch. Be careful not to break off spurs while thinning – spurs produce flowers and fruit for many years if not broken. Recommend to thin apples within 40 days of full bloom and pears within 60 days of full bloom.
Peaches & nectarines: Should be spaced at one fruit per 6-8” of branch. Fruits that are joined should be removed. Recommend to thin peaches about 70 days past full bloom.
Plums: Should be thinned to have spacing at 6” between fruit along the branch.
Apricots: If tree experiences heavy fruit set thin fruit spaced to 3” along branch.
If you are new to the orchard, know that trees will exhibit “June Drop” which is when the tree will naturally drop fruit. Some prefer to wait until this event happens to thin, however there are great advantages to thinning early. More details can be found in the links below.
» https://extension.wsu.edu/maritimefruit/fruit-thinning-for-high-quality/
» https://extension.oregonstate.edu/gardening/berries-fruit/fruit-thinning
2020 Peachtree Borer
General Landscape and Garden Treasure Valley
Peachtree Borer (Synanthedon exitiosa)
Posted on: June 10, 2020 by Nic Usabel
Peachtree bores have been caught in traps, maintained by Idaho Master Gardeners, in Middleton and Nampa. This pest is a concern for stone fruits: Peach, nectarine, apricot, cherry, and plum. Key symptoms of peachtree borer infestation is the presence of sawdust and frass mixed with the gummy substance near the base of the trunk. Prevention is the best method of control.
Larvae injure the fruit tree primarily by burrowing into the tree trunks just at or below the soil line but may enter trunk up to 12” above the soil line. Larvae feed in the cambium beneath the bark girdling the tree.
Chemical Control, Home Use: For orchards less than 1 acre, or for home yard trees, preventative trunk sprays are the primary control. Apply the first application immediately after first trap catch and repeat application based on product label guidelines. Follow the required pre-harvest interval (time between last application and allowed harvest of fruit) of insecticide product. Apply insecticide as a bark drench at a rate of ½ to 1 gallon of spray mix per tree. Thoroughly cover the lower 12 inches of trunk and soak the ground at the base of tree. Do not allow the sprays to contact fruit. For chemical option review the PNW handbook link below.
Chemical Control, Commercial: Reference the PNW handbook link below to see spring and summer application recommendations.
Cultural Control: Larvae inside the trunks can be killed by inserting a wire into entry holes. Kill larvae in the late summer and fall before they spend the winter and inflict their most extensive feeding damage the following spring. Keep base of tree free of vegetation – heat and dryness reduce the survival of eggs and larvae.
» https://pnwhandbooks.org/insect/tree-fruit/peach-nectarine/peach-nectarine-peachtree-borer
» https://extension.colostate.edu/topic-areas/insects/peach-tree-borer-5-566/
Oregon COVID-19 Costs for Food Security & Farmworker Safety Program
All Crops Northern Idaho
Posted on: June 10, 2020 by Stuart Reitz
Oregon’s Food Security and Farmworker Safety Program provides assistance to Oregon’s agricultural producers in order to help secure Oregon’s food supply chain and protect essential agricultural workers from COVID-19 exposure and illness.
The COVID-19 emergency caused Oregon’s Occupational Safety and Health Administration (OR-OSHA) to issue temporary rules requiring increased field sanitation measures and more stringent labor housing and transportation regulations.
Agricultural producers are responsible for complying with COVID-19 emergency OR-OSHA requirements for Housing, Transportation, and Field Sanitation. Producers faced with additional costs because of this can apply for assistance in any or all categories. There is no need to fill out a separate application for each; a single application will cover all 3 categories.
Please see https://www.oregon.gov/oweb/fsfs/Pages/index.aspx for application and additional information. One application will cover the three program areas of housing, transportation, and field sanitation.
Additional rules for worker protection is available from Oregon OSHA is at https://osha.oregon.gov/Documents/COVID-19-Emergency-Ag-Rule-Q-A.pdf
» https://www.oregon.gov/oweb/fsfs/Pages/index.aspx
» https://osha.oregon.gov/Documents/COVID-19-Emergency-Ag-Rule-Q-A.pdf
Volunteer potato control recommendations for 2020
Potato All Locations
volunteer potatoes
Posted on: June 10, 2020 by Jerry Neufeld
The pdf below contains "Volunteer potato control recommendations for 2020." This information is provided by Dr. Pamela J.S. Hutchinson, Potato Cropping Systems Weed Scientist, University of Idaho Aberdeen R&E Center.
» Volunteer_potato_control_recommendations_for_2020_HUTCHINSON_June_02_2016.pdf
Stripe rust (or Yellow Rust) in Wheat - Western Idaho
All Crops All Locations
Stripe rust on wheat
Posted on: June 5, 2020 by Juliet Marshall
Stripe rust has found its way to western Idaho, reported from at least two locations (with accompanying picture), one location was on UI Magic CL+. (Thanks Oliver Neher!) The growth stage of winter wheat in that area is past the window of fungicide application, and is currently in grain fill. Spring wheat is still vulnerable and susceptible varieties should be scouted for the appearance of stripe rust.
In the Magic Valley and into eastern Idaho, winter wheat is heading and susceptible varieties are still vulnerable to significant yield loss associated with stripe rust infection. Stripe rust reaction of last year’s varieties in the Extension Variety Trials is reported in the 2019 Small Grains Report available online at https://www.uidaho.edu/extension/cereals/scseidaho. (The data is included here as attachments.). Also keep an eye out for stripe rust on barley. No barley stripe rust has been reported so far this year.
Please note that while some wheat varieties were reported as resistant in 2019, race changes were reported in California by Dr. Mark Lundy (UC Davis pathologist) in this year’s crop; therefore scouting of all varieties is recommended this season. Please report observations so we can keep track of the in-season spread.
The weather forecast for this and especially next week is very conducive to stripe rust spread and infection. Fungicide application recommendations developed through NCERA-184 pathologists, coordinated by Dr. Erick De Wolfe Kansas State University, is also attached.
» https://www.uidaho.edu/extension/cereals/scseidaho
New edition of Potato Production Systems
Potato All Locations
Posted on: June 5, 2020 by Jerry Neufeld
Dr. Mike Thornton, Professor of Plant Sciences, University of Idaho Parma Research and Extension Center is reporting that a new edition of Potato Production Systems was published recently by Springer Publishing. The comprehensive book includes contributions by 39 authors, 22 of whom are current or emeritus U of I faculty. The book, originally published by UI Extension in 2003, functions as a textbook for CALS Potato Science course and as a reference for potato industry professionals. You can find more information about the book on the Springer website by clicking on the link below.
2020 Peach Twig Borer
General Landscape and Garden Treasure Valley
Peach Twig Borer (Anarsia lineatella)
Posted on: June 4, 2020 by Nic Usabel
Management of the peach twig borer, based on degree days and trap catches, will take place June 5 – June 10. This pest is a concern for those growing peach, nectarine, apricot, plum and prune. Adult moths are 0.3 – 0.5 inches long, with light and dark gray mottled wings. Scales on the front of head cause the head to appear pointed. The larva is a caterpillar, about 0.5 inch long, with a dark brown head and distinctive, alternating light and dark bands on the body.
Larvae injure fruit trees by feeding on the buds and twigs early in the season, then the larvae bore into the shoots, causing a characteristic "flagging" or wilting of the new growth. Later generations of larvae feed within shoots or even on the fruit itself. Flagging of twigs indicates an infestation.
For chemical control management options review the PNW Handbook link below to select a control option appropriate for operation. Apply according to label directions.
For cultural controls prune out shoot strikes in the late spring and early summer as soon as they are detected to prevent these larvae from completing development and contributing to summer generations of the pest. If old shoot strikes are observed during pruning in late winter to early spring, plan to apply early season controls. Old strikes hold onto the dead leaves and appear as “flagged” terminals.
» https://pnwhandbooks.org/insect/tree-fruit/peach-nectarine/peach-nectarine-peach-twig-borer
» https://climate.usu.edu//includes/pestFactSheets/Peach-Twig-Borer.pdf
EPA Releases Temporary Guidance on Respiratory Protection for Agricultural Pesticide Handlers During COVID-19
All Crops All Locations
Posted on: June 3, 2020 by Christy Tanner
The temporary guidance outlines approaches to address the unavailability of required respiratory protection and respiratory fit testing that should first be exhausted before considering any alternative options. Options include:
• Use alternative NIOSH-approved respirators offering equivalent or greater respiratory protection than those required on the pesticide label;
• Hire commercial applicator services with enough respirators and respiratory protection capabilities;
• Opt to use agricultural pesticide products that do not require respirators; or
• Delay pesticide applications until another compliant option is available.
If the above options are exhausted, EPA’s guidance provides additional options with strict terms, conditions, and exhaustion requirements to minimize potential incremental risks to workers:
• Reuse and extended use of disposable N95 filter facepiece respirator;
• Use of “expired” respirators;
• Use of respirators certified in certain other countries or jurisdictions meeting protective conditions outlined; or
• Delay the annual respirator “fit test.”
This is a temporary policy. EPA will assess the continued need for and scope of this temporary guidance on a regular basis. To read the guidance in full and to learn more about EPA’s Worker Protection Standard, visit this webpage: https://www.epa.gov/enforcement/statement-regarding-respiratory-protection-shortages-and-reduced-availability-respirator
COVID-19 Guidance for Ag Employers and Workers
All Crops All Locations
Posted on: June 2, 2020 by Stuart Reitz
The CDC and US Department of Labor have released guidance to protect agricultural workers on farms and other work sites. Please take time to review the recommendations to maintain a safe work environment and reduce the spread of COVID-19 in your communities.
https://www.cdc.gov/coronavirus/2019-ncov/community/guidance-agricultural-workers.html
» https://www.cdc.gov/coronavirus/2019-ncov/community/guidance-agricultural-workers.html
Ag Talk Tuesday - June 2
All Crops All Locations
Posted on: June 1, 2020 by Juliet Marshall
Greetings!
This Tuesday (June 2) brings another Ag Talk Tuesday session of the season. These online interactive sessions occur every 1st and 3rd Tuesday of the growing season (May through August) from 11:00 AM to 1:00 PM MT and provide an opportunity for UofI and the ag industry to share and exchange information about current season crop issues. Featured topics are also presented.
After crop updates, the featured topics are "In-season nutrient management with soil and petiole sampling” with Linda Schott and
"Weed and chemical load on compost vs manure” with Mario E. de Haro-Martí.
You must Register in advance for this meeting:
https://uidaho.zoom.us/meeting/register/vpAkc-uvqTwpZF4DlEg_ZcN8xYE9ezZSkQ
After registering, you will receive a confirmation email containing information about joining the meeting.
If you have already registered, you will not need to register again.
Attached is a flyer for your use to help spread the word.
A schedule with featured topics is available here: https://webpages.uidaho.edu/extension-seed-potato/ATT.html Check back often as items are added regularly.
Sincerely,
Your Ag Talk Tuesday Organizers:
Kasia Duellman
Pamela J.S. Hutchinson
Juliet Marshall
» https://webpages.uidaho.edu/extension-seed-potato/ATT.html
2020 Western Cherry Fruit Fly - ISDA
Tree Fruits Treasure Valley
Western Cherry Fruit Fly (Rhagoletis indifferens)
Posted on: May 29, 2020 by Paul Castrovillo, Ph.D.
On May 28 the first 2020 Western Cherry Fruit Fly captured in an Idaho State
Department of Agriculture WCFF trap was reported from Canyon County.
Historically we expect to find WCFF in Gem County traps about a week after
the first one is found in Canyon County.
Online phenology and degree-day models for WCFF predicted first flight on
May 24 in Ontario, May 27 in Caldwell and Emmett, May 28 in Parma and Boise
and May 30 in Nampa.
If treatment for WCFF is not already underway it should begin now.
For more information contact Paul Castrovillo at
paul.castrovillo@isda.idaho.gov or call 208-332-8627.
2020 Sequoia Pitch Moth in Pines
General Landscape and Garden Treasure Valley
Sequoia Pitch Moth in Pines (Synanthedon sequoia)
Posted on: May 28, 2020 by Nic Usabel
The sequoia pitch moth (SPM) has been found in traps. Austrian pine, scotch pine, and other ornamental pines serve as host for the SPM. Primarily found in the truck and large branches where larvae feed on cambium tissue and sapwood. Larvae are found within large resin masses on bark or in a bark notch behind the resin mass.
Damage is primarily aesthetic causing unsightly resin masses on trees. Some trees may experience limb dieback, tree stress or tree death in severe cases. Trees under attack are almost always previously stressed.
There are no recommended insecticide control options for SPM. Management is gained with cultural control; properly plant and keep trees healthy, pick resin masses from the tree and crush larvae within. Avoid pruning or injuring trees April through August while adults are active.
» http://ipm.ucanr.edu/PMG/PESTNOTES/pn7479.html
» https://utahpests.usu.edu/ipm/ornamental-pest-guide/arthropods/wood-borers/sequoia-pitch-moth
2020 Western Cherry Fruit Fly
General Landscape and Garden Treasure Valley
Western Cherry Fruit Fly (Rhagoletis indifferens)
Posted on: May 22, 2020 by Nic Usabel
A western cherry fruit fly sample was identified during the University of Idaho Extension, Canyon County Master Gardener plant clinic on May 22. Western cherry fruit fly adults are about 0.2 inch long. They have brownish to black wings with dark bands. White maggots infest cherries. The mature maggot makes a hole in the cherry as it exits. Flies overwinter as pupae in the soil.
Once the cherries start to blush (ripen to a salmon blush color) the fruits are susceptible to egg-laying by the adult females. Consider the maturity of the ripest fruit in the orchard when determining control methods. Spraying a product with the active ingredient kaolin can create a physical barrier that prevents females from laying eggs into the developing fruit. Follow label directions for application. For additional control options see the links below.
Current models indicate the degree days, as of May 21, between 1007 DD and 1030 DD depending on location. Forecasted degree days at 1060 DD is predicted to be May 24.
» http://treefruit.wsu.edu/crop-protection/opm/western-cherry-fruit-fly/
» https://climate.usu.edu//includes/pestFactSheets/WC-Fruit-Fly.pdf
» https://pnwhandbooks.org/insect/tree-fruit/cherry/cherry-western-cherry-fruit-fly
Ag Talk Tuesdays - May 19 - Register in Advance to Attend
All Crops All Locations
Posted on: May 16, 2020 by Kasia Duellman, Juliet Marshall, Pam Hutchinson
Hello All:
Please join UI Extension Specialists, Extension Educators and ag professionals for Ag Talk Tuesdays. These sessions occur every first and third Tuesday, May through August. Listen to a featured presentation, hear crop pest and disease updates for the current season, engage with industry professionals, ask questions, provide your crop updates, or sit back and listen on your phone, tablet or laptop with Zoom.
Register in advance for this meeting (required):
https://uidaho.zoom.us/meeting/register/vpAkc-uvqTwpZF4DlEg_ZcN8xYE9ezZSkQ
Register once to be able to attend all 2020 sessions.
To learn more about Ag Talk Tuesdays and to view a schedule of featured presentations, please check the calendar here (check back often as new topics are added regularly): https://webpages.uidaho.edu/extension-seed-potato/ATT.html
After the sessions, read the Ag Talk Report newsletter - this newsletter provides a summary of Ag Talk Tuesday highlights, plus additional timely information that wasn't covered during the live session. The current issue and past issues can be found here:
https://webpages.uidaho.edu/extension-seed-potato/ATT.html
Please distribute this information far and wide.
Sincerely,
Kasia
--------------------------------------
KASIA M. DUELLMAN, Ph.D.
Assistant Professor and Extension Seed Potato Specialist
College of Agricultural and Life Sciences
Entomology, Plant Pathology and Nematology
kduellman@uidaho.edu
webpages.uidaho.edu/extension-seed-potato/
208-757-5476 | 701-793-9456 (Cell)
U of I Idaho Falls | 1776 Science Center Drive, Suite 205 | Idaho Falls ID 83402 | United States
2020 Leafminer in Leafy Greens
General Landscape and Garden Treasure Valley
Leafminer (Liriomyza spp.)
Posted on: May 14, 2020 by Nic Usabel
The leafminer (Liriomyza spp.) can be destructive to beets, spinach, chard, and other leafy greens. Leafminer describes the larval stage of various insects but are most commonly those that feed on vegetables. The adults are small black to gray flies with yellow markings in order Diptera.
Leafminer larvae form visible tunnels (mines) as they feed within the leaf tissue affecting the market value of vegetables harvested for edible foliage. Larvae are nearly translucent white or yellow color and about 0.25 inch long when mature.
To control regularly check leaves for mines which are sometimes more visible on the underside. For home gardeners using floating row covers to exclude egg-laying females, removing and destroying infested leaves and preserving natural enemies (parasitic wasps) which help control leafminer populations. See links for additional management options for home and commercial use.
» https://pnwhandbooks.org/insect/vegetable/vegetable-pests/hosts-pests/spinach-leafminer
» https://pnwhandbooks.org/insect/vegetable/vegetable-pests/hosts-pests/beet-table-leafminer
» https://pnwhandbooks.org/insect/vegetable/vegetable-pests/hosts-pests/chard-swiss-leafminer
2020 Apple Codling Moth, First Generation Degree Day Update
General Landscape and Garden Treasure Valley
Codling Moth (Cydia pomonella)
Posted on: May 12, 2020 by Nic Usabel
Data as of May 11, current degree day was 187. Please reference the previous alert at http://pnwpestalert.net/alerts/index/2020-apple-codling-moth-first-generation for more detailed management options.
Options A, 200 DD: Forecasted degree day for May 12 is 195 and May 13 at 202.
Option B, 220 – 250 DD: Forecasted degree day for May 15 is 214 and May 18 at 249.
» http://pnwpestalert.net/alerts/index/2020-apple-codling-moth-first-generation
2020 Apple Codling Moth, First Generation
General Landscape and Garden Treasure Valley
Codling Moth (Cydia pomonella)
Posted on: May 8, 2020 by Nic Usabel
The first apple codling moths were trapped at the end of April (Biofix on April 25). Currently the degree day model is reporting 131 degree days (DD) as of May 7. There are different management options to consider when controlling this pest.
Option A: Starting at 200 DD, forecasted to be May 11, apply a mixture of water and horticultural oil at 1% concentration to smother egg infestation. Follow with first application of insecticide at 350 DD. Reapply insecticides based on the protection interval stated on the label.
Option B: Starting at 220-250 DD, forecasted to be May 14, apply insecticides that target newly hatched larvae. Reapply insecticides based on the protection interval stated on the label.
Reference publication links to view insecticide options for commercial or residential sites. Commercial products with the active ingredients including; spinetoram, acetamiprid, chlorantraniliprole, etc. Residential products with active ingredients including; lambda-cyhalothrin (restricted use pesticide), or esfenvalerate and Spinosad (general-use pesticides). Non-spray option is to bag the fruit.
This pest needs prevention all season long for clean fruit.
» https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth
» https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1879&context=extension_curall
» https://extension.colostate.edu/topic-areas/insects/codling-moth-control-in-home-plantings-5-613/
2020 Billbug Grub Control
General Landscape and Garden Treasure Valley
Billbug Grubs
Posted on: May 6, 2020 by Nic Usabel
The term grub is used to designate the larvae of lawn damaging insects. In Idaho, the most common and destructive is the billbug. There are four species of billbug in Idaho: Bluegrass, Rocky Mountain, Phoenix, and Hunting.
Current degree day modeling indicates that 30% of adult billbugs are present with a forecasted 50% adult billbug activity on May 23. If you commonly experience billbug damage, your neighborhood experiences billbug damage, or you have Kentucky Bluegrass this timeframe can be used to apply a systemic insecticide for controlling billbugs if you desire.
Nonchemical control methods include selecting turf varieties of tall fescue, fine fescue, and perennial ryegrass. Select endophytic cultivar(s) in which a fungus produces a compound toxic to grubs.
Systemic insecticide control is most effective. Choose a product that lists one of the following active ingredients: chlorantraniliprole, clothianidan, imidacloprid, or thiamethoxam. Follow label instructions to ensure safety and success.
» https://www.extension.uidaho.edu/publishing/pdf/CIS/CIS1204.pdf
» https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1860&context=extension_curall
» https://extension.colostate.edu/topic-areas/insects/billbugs-and-white-grubs-5-516/
2020 Peach Leaf Curl Detected
General Landscape and Garden Treasure Valley
Peach Leaf Curl (Taphrina deformans)
Posted on: May 4, 2020 by Nic Usabel
The Master Gardeners operating the University of Idaho Extension, Canyon County plant diagnostic clinic have identified samples of peach leaf curl. Peach leaf curl is caused by a fungus (Taphrina deformans) and there are no management options after infection has set in. Dispose of symptomatic leaves which fall to the ground. Control can be achieved in the fall with a single application of fungicides after 90% of leaves have fallen. A follow-up alert with control options will be sent in the fall.
Spores of this fungus overwinter on bark, twigs, and old infected leaves. Infection occurs through bud scales in mid- to late winter just as buds begin to swell. Slow growing shoots and leaves can be infected during cool and wet growing seasons. Maximum susceptibility is between bud break and petal fall.
» https://pnwhandbooks.org/plantdisease/host-disease/peach-prunus-persica-leaf-curl
» https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1736&context=extension_curall
