Landscape & Garden Alerts
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Squash Bug confirmed in 2018 squash.
Landscape and Garden All Locations
Anasa tristis
Posted on: June 30, 2018 by Rich Guggenheim
Squash bugs have been confirmed in the Treasure Valley.
It attacks all cucurbits and vine crops but is most damaging to squashes and pumpkins. The insect has a disagreeable odor when crushed and is one of many insects known by the nickname "stink bug."
They may be difficult to see because their color matches the soil and because they are usually hiding under the vines, leaves or clods of dirt. The adults feed on sap from the plant leaves as they lay clusters of a dozen of more, large, brick-red to yellow-brown eggs on the lower sides of the leaves.
Handpick and discard egg clusters and nymphs as they appear. Use garden insecticides such as Sevin, permethrin or insecticidal soap according to label directions. Sprays are generally more effective than dusts, but must be reapplied frequently. Avoid spraying plants in bloom. If spraying during bloom is necessary, spray at night after honey bees have quit foraging for the day.
» https://extension.usu.edu/juab/ou-files/ENT-120-08.pdf
» http://extension.colostate.edu/topic-areas/insects/squash-bug-management-in-home-gardens-5-609/
Peach Tree Borer 2018
Landscape and Garden All Locations
Peach Tree Borer
Posted on: June 29, 2018 by Dian Roberson
We have been finding Peach Tree Borers in our traps! They will attack peach, cherry, plum, and other stone fruits. It is the larva that does the most damage, feeding on the tree roots. Check out the information below!
» https://pnwhandbooks.org/insect/tree-fruit/peach-nectarine/peach-nectarine-peachtree-borer
» http://extension.colostate.edu/topic-areas/insects/peach-tree-borer-5-566/
Spider Mite Warning
Landscape and Garden All Locations
Spider Mite
Posted on: June 22, 2018 by Dian Roberson
As temperatures rise in June be on the lookout for spider mites. They can attack a wide variety of crops and ornamentals. Look for bronzing of leaves or mite webbing. Dry, hot conditions favor all spider mites, this is why they are so important in more arid regions like the Treasure Valley. They feed more under dry conditions, as the lower humidity allows them to evaporate excess water they excrete. At the same time, most of their natural enemies require more humid conditions and are stressed by arid conditions. Plants stressed by drought can make them more nutritious to spider mites so check your irrigation systems to make sure they are functioning properly.
» https://pnwhandbooks.org/insect/hort/landscape/common/landscape-spider-mite
» http://extension.colostate.edu/topic-areas/insects/spider-mites-5-507/
Scale on Honeylocust (Nampa)
Landscape and Garden All Locations
Pulvinaria innumerabilis
Posted on: May 30, 2018 by Rich Guggenheim
Cottony maple scale occasionally builds up in large numbers on branches and leaves of honeylocust, becoming quite conspicuous as egg sacs swell in June and July. The overwintering stage of this scale (mated female) can be controlled with dormant oil applications made before new growth in spring. These treatments also can help suppress spider mites, eriophyid mites and plant bugs that overwinter on trees.
Newly hatched crawlers generally appear in late June through July and can be controlled at that time with Sevin, Orthene or various pyrethroids. Imidacloprid (Merit) applied as a soil systemic treatment should also be effective, provided sites are irrigated. Natural controls generally maintain cottony maple scale at nondamaging levels and sustained infestations lasting more than one season are very rare.
» http://ipm.ucanr.edu/PMG/PESTNOTES/pn7408.html
» http://extension.colostate.edu/topic-areas/insects/insect-and-mite-pests-of-honeylocust-5-571/
» http://ipm.ucanr.edu/PMG/PESTNOTES/pn7410.html
» https://utahpests.usu.edu/uppdl/files-ou/factsheet/Soft%20Scales%20in%20Utah.pdf
Western Cherry Fruit Fly 2018
Cherry Treasure Valley
Western Cherry Fruit Fly
Posted on: May 25, 2018 by Paul Castrovillo
On May 22 the first 2018 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 about a week after the first one is found in Canyon County.
Online phenology and degree-day models for WCFF predict first flight on May 21 in Ontario and Parma, May 24 in Caldwell, May 25 in Emmett, May 29 in Boise and May 31 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.
» https://pnwhandbooks.org/insect/tree-fruit/cherry/cherry-western-cherry-fruit-fly
» http://wci.colostate.edu/Assets/pdf/western.cherry.fruit.fly.pdf
» https://extension.wsu.edu/chelan-douglas/agriculture/treefruit/pestmanagement/cherryfruitfly/
Coddling Moth 2018
Apple Treasure Valley
Posted on: May 21, 2018 by Dian Roberson
Coddling Moth has been detected in traps so it is time to take action! This is a small moth that lays eggs on the blossom end of Apple and Pear fruit. The larvae them bore into and ruin your fruit. Check out the publications and links below to help you choose the best control for your landscape.
» http://extension.colostate.edu/topic-areas/insects/codling-moth-control-in-home-plantings-5-613/
» https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth
Pear Blister Mite
Tree Fruits All Locations
Eriophyes pyri
Posted on: May 9, 2018 by Rich Guggenheim
Pear leaf blister mite, Eriophyes (=Phytoptus) pyri , is an eriophyid mite found on pear, and apple. Young trees can be damaged by severe infestations.
CONTROL:
Treat large infestations in early fall, before leaf drop, when mites are migrating from leaves to buds. Options include carbaryl, horticultural oil, or lime sulfur. Dormant oil applications in spring are also effective. Blister mites cannot be treated in summer.
» http://ipm.ucanr.edu/PMG/r603400511.html
» http://oregonstate.edu/dept/nurspest/pear_leaf_blister_mite.htm
» https://utahpests.usu.edu/ipm/agricultural/fruit/blister-mites
Peach Leaf Curl
Tree Fruits All Locations
Peach Leaf Curl
Posted on: May 8, 2018 by Rich Guggenheim
Taphrina deformans
Peach leaf curl is affecting peach leaves now. Proper timing of fungicides, in the fall, can prevent this disease aLime sulfur or Ziram work great for commercial growers. Home grown trees will need something but avoid Monterey Liqui-Cop as it did not work. Ortho MAX Garden Disease Control was a little better than nothing. Bottom line for home growing - replace with a resistant tree after the current ones dies.
» https://pnwhandbooks.org/plantdisease/host-disease/peach-prunus-persica-leaf-curl
» http://ipm.ucanr.edu/PMG/PESTNOTES/pn7426.html
» https://extension.usu.edu/files/publications/factsheet/peach-leafcurl.pdf
» http://extension.oregonstate.edu/gardening/node/924
Peach Tree Borer
Tree Fruits All Locations
Synanthedon exitiosa
Posted on: May 4, 2018 by Rich Guggenheim
Peach tree borer are in the clear wing moth category. They usually attack prunus trees near the ground. Signs of infestation include gumosis oozing from the trunk near the soil.
Peachtree borer eggs are laid during the summer on the bark at the base of trees. Larvae overwinter in the tree trunk near the soil line. They feed in the crown area and burrow up into the tree
» https://pestadvisories.usu.edu/2017/04/18/gummosis/
» http://extension.colostate.edu/topic-areas/agriculture/cytospora-canker-in-tree-fruit-crops-2-953/
2018 Spring Garden Festival.
Announcements All Locations
2018 Spring Garden Festival. Credits available!
Posted on: April 16, 2018 by Rich Guggenheim
The University of Idaho Extension Master Gardener Volunteers are hosting their 2018 Spring Garden Festival. Happening on April 21st from 9-4 at the UI Extension Office located at 501 Main St in Caldwell, this all day event will feature 4 tracks of concurrent courses.
Cost $30.
The pesticide track will offer ISDA recertification credits.
The arboriculture track will offer ISA credits for certified arborists.
The JMG track offers professional development for teachers.
And there is a gardening 10 track for those who simply want to explore the basics.
Whether you are a beginner or an expert, this event has something to help everyone grow! There is also a free plant sale featuring plants grown by Master Gardener volunteers!
For more information, and to register, call 208-459-6003.
Billbugs/Lawn grub proper treatment protocols.
Landscape and Garden All Locations
Lawn Grubs
Posted on: April 10, 2018 by Rich Guggenheim
Billbugs (Sphenophorus spp) can be a problem in lawns planted with Kentucky Bluegrass (KGB). Proper timing of pesticide applications is *critical* for controlling this pest! The most common type of lawn grub found in the Treasure Valley is the Denver Billbug, although in some areas of Boise there is the Japanese Beetle, which is of special concern. Proper identification of grubs is important so that proper treatment may be applied. Management using chemical pesticides need to coincide with certain life cycles of the insect in order to be effective. You may bring a sample of the grub or adult to your local University of Extension office where they may be identified and you may obtain information on proper management of this pest. Properly fertilizing, watering, and mowing of your turf can eliminate the need to apply chemicals to your lawn to control grubs.
» http://extension.uidaho.edu/clearwater/files/2014/10/Controlling-Billbug-Grubs-in-Lawns.pdf
» https://utahpests.usu.edu/uppdl/files-ou/factsheet/Billbugs.pdf
» http://extension.colostate.edu/topic-areas/insects/billbugs-and-white-grubs-5-516/
Pear psylla
Tree Fruits All Locations
Cacopsylla pyricola
Posted on: April 7, 2018 by Rich Guggenheim
Pear psylla is one of the most serious insect pest of pears because of its ability to develop resistance to insecticides and to vector the pathogen that causes pear decline.
Adults hold their transparent wings rooflike over their dark to reddish brown bodies when at rest; they resemble tiny cicadas. A dark spot on the top middle edge of both wings helps to distinguish pear psylla from other psylla. Tiny, elongated yellowish eggs, which are barely visible without a hand lens, are laid on or near fruit spurs starting in late January or early February.
Pesticides applied to pears greatly reduce the effectiveness of natural enemies. Soft pesticide programs that spare natural enemies would reduce the need for chemical control of pear psylla and other pear pests.
» http://jenny.tfrec.wsu.edu/opm/displaySpecies.php?pn=120
» http://ipm.ucanr.edu/PMG/r603301111.html
» https://extension.usu.edu/juab/ou-files/PearPsyllaCacopsyllaPyricola.pdf
» https://blogs.cornell.edu/jentsch/2015/08/06/pear-psylla-late-season-management-options/
White apple leafhopper
Tree Fruits All Locations
Homoptera: Cicadellidae
Posted on: April 7, 2018 by Rich Guggenheim
The overwintering eggs begin hatching at about the tight cluster stage of apple development, with peak hatch during or after bloom. There are five nymphal instars. It takes about 27 days for nymphs of the first generation to develop and 23 days for second generation nymphs.
» http://jenny.tfrec.wsu.edu/opm/displayspecies.php?pn=360
» https://utahpests.usu.edu/uppdl/files-ou/factsheet/white-apple-leafhoppers97.pdf
» http://ipm.ucanr.edu/PMG/r4301811.html
» https://pnwhandbooks.org/insect/tree-fruit/apple/apple-leafhopper
Fruit Orchard Leaf Rollers.
Tree Fruits All Locations
Fruit Tree Leaf Rollers
Posted on: April 7, 2018 by Rich Guggenheim
Various types of leaf rollers may cause damage to fruit trees. Begin using traps to monitor and establish bio-fix and management timing.
» https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2794&context=extension_curall
Coryneum Blight
Tree Fruits All Locations
Coryneum blight/shothole disease
Posted on: April 6, 2018 by Rich Guggenheim
Environmental conditions are favorable for the development of Coyneum blight on prunus spp. the fungal pathogen, Wilsonmyces carpophhilus attacks peach, apricot, plum, and cherry. Early season infections are characterized by the presence of a reddish-purple halo surrounding a light tan, scab-like center spot, which is the dead fruit skin killed by the fungus. These are similar to damage caused by San Jose Scale, and great care is required to avoid confusion. Depending on weather factors, the spots may remain tiny or enlarge to 1/4 inch in diameter. In severe cases, lesions coalesce and cause skin cracking. Severe, early season infections also can have gummy ooze on the fruit surface.
Management includes cleaning and removal of infected plant material. Fungicides can be used, but are preventalitive and not curative and may be applied at schuck fall. Commercial growers may need to apply at regular intervals during wet weather.
» https://utahpests.usu.edu/ipm/agricultural/fruit/coryneum-blight
» http://extension.colostate.edu/topic-areas/agriculture/coryneum-blight-2-914/
» http://ipm.ucanr.edu/PMG/GARDEN/FRUIT/DISEASE/shothole.html
Environmental Conditions Favor Fire Blight Development
Apple All Locations
Erwinia amylovora.
Posted on: April 6, 2018 by Rich Guggenheim
Current environmental conditions favor the development of Fire Blight in apple and related family of trees such as pyracantha, hawthorn, and cotoneaster. This disease does not affect stone fruit such as cherries, plum, apricot, or peach.
Management is best controlled by puning out diseased plant parts. Bordeaux mixture, Streptomycin, and copper sprays are also used to manage this bacterial disease.
» http://extension.usu.edu/files/factsheets/Disease%20027%20UPDC%20Fire%20blight.PDF
» http://treefruit.wsu.edu/crop-protection/disease-management/fire-blight/
» http://extension.colostate.edu/topic-areas/yard-garden/fire-blight-2-907/
Boxelder bugs
Landscape and Garden All Locations
Box Elder Bugs
Posted on: March 30, 2018 by Rich Guggenheim
Boxelder bugs are active. Management is extremely difficult. Management techniques include:
Exclusion- sealing cracks and around windows, doors, and other entry points.
Eradication of female box elder trees.
Vacuuming- cleaning up the bugs with a shop vac.
Diatomaceous earth can create an effective barrier along with certain contact insecticides. However, repeated insecticide applications have been shown to quickly create resistance and will dramatically reduce natural enemies. Therefore, insecticides should not be used unless necessary to prevent substantial fruit damage. Always read and follow all label instructions.
» https://www.cals.uidaho.edu/edcomm/pdf/CIS/CIS1208.pdf
» http://oregonstate.edu/dept/kbrec/boxelder-bug
» http://www.extension.uidaho.edu/publishing/pdf/CIS/CIS1208-S.pdf
Clover mites
Landscape and Garden All Locations
Mites
Posted on: March 20, 2018 by Rich Guggenheim
Spider and clover mites have been confirmed in landscapes throughout Canyon County. They are especially problematic on the south and west facing yards where temperatures are warmer and drier. They can invade homes, where they become a nuisance. Control can be obtained with diatomaceous earth as a barrier. Do not use insecticides to control mites. Always read and follow label instructions.
» http://extension.colostate.edu/docs/pubs/insect/05505.pdf
» https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1877&context=extension_curall
» https://www.extension.umn.edu/garden/insects/find/clover-mites/
» https://www.unce.unr.edu/publications/files/ho/other/fs9605.pdf
2018 Spring Garden Festival
Announcements All Locations
Posted on: March 5, 2018 by Rich Guggenheim
Join us for the 2018 Spring Garden Festival and Plant Sale on April 21st from 9:30 am to 4 PM!
Four tracks of classes are available:
- ISA credits are available for the arborist track
- ISDA credits are available for pesticide track
- PD credits for teachers on JMG track.
- Gardening 101!
Come learn about youth gardening, and general introduction to gardening in Idaho with these all day classes. The cost is $30 for the full day!
To register call 208-459-6003.
Extension programs are available to all. For those requesting special accommodation, please call Rich Guggenheim at 208-459-6003 by APril 15.
Spring Garden Festival. ISA, ISDA, Teacher PD available.
All Crops All Locations
Garden Classes!
Posted on: February 20, 2018 by Rich Guggenheim
Join us on April 21st for an all day gardening festival with four tracks to choose from. A plant sale to benefit the Master Gardener Volunteer program will also be available. See the attached flyer for details.
The cost is $30 for the entire day. To register for a track, contact the University of Idaho Extension Office in Canyon County at 208-459-6003
» https://www.uidaho.edu/extension/county/canyon/horticulture/festival
Weeds and insects
Landscape and Garden All Locations
Early emergence of weeds and insects.
Posted on: February 14, 2018 by Rich Guggenheim
With unseasonably warm temperatures this winter, weeds and insects have already begun to emerge. It is predicted that weeds and insects will be severe this year. In addition to trapping and monitoring, application of dormant oils, pre emergent herbicides, and other preventative pest management measures should have already begun.
One of the most effective ways to manage weeds in the landscape is to apply a 4-6 inch layer of arborist chips.
For more information on controlling pests, including weeds and insects in your landscape, contact your local University of Idaho Extension office.
» http://extension.colostate.edu/topic-areas/insects/insect-control-horticultural-oils-5-569/
» http://ucanr.edu/datastoreFiles/268-754.pdf
» https://oregonstate.edu/dept/nursery-weeds/feature_articles/top_10/Top_10_reasons.html
Fruit Tree Pruning Workshop
Announcements All Locations
2018 Fruit Tree Pruning Workshop
Posted on: February 14, 2018 by Rich Guggenheim
The University of Idaho Pomology and Viticulture Program’s Annual Fruit Tree class will be held on Saturday, February 17th at 9:00 am until about 1:00 pm. It will be held in the large meeting room at Western Laboratory, 211 Hwy 95, Parma, ID 83660. After the classroom session (9:00-10:30), you will go to the UI orchards/vineyards for hands on demonstrations. You may bring your pruning tools if you would like. They will be cleaned before you start pruning. Please let us know if you are coming by Friday.
If you have any questions, please don’t hesitate to contact us.
University of Idaho
Parma Research & Extension Center
29603 U of I Lane
Parma, ID 83660
Phone: (208) 722-6701 ext. 228
Fax: (208) 722-6708
» https://www.uidaho.edu/cals/parma-research-and-extension-center
Grape School location Change
All Crops All Locations
2018 Grape School
Posted on: February 8, 2018 by Rich Guggenheim
Due to the large number of participants for the UI Grape School on Saturday, 9:00 am, Feb. 10th, we have had to change the location. It will now be held at the Western Laboratory’s large meeting room. The address is: 211 Hwy 95, Parma, ID 83660, just north of Parma on the west side of the highway. Their phone number is 208 722-6564 if you should have any questions.
Thank you and sorry for such short notice.
Maurine for Dr. Essie Fallahi
2018 Grape School
Grapes Treasure Valley - Idaho
Posted on: February 6, 2018 by Rich Guggenheim
The Pomology and Viticulture Program Annual Grape School will be held on Saturday Feb 10, 2018 from 9 am -12:30 pm at University of Idaho Parma Research and Extension Center. Physiological and practical aspects of grape production in Idaho, from planting to training and harvesting will be discussed. Participants will also practice different methods of grape pruning at the University of Idaho Vineyard. Free of charge. Please let us know if you or someone you know is joining us by Thursday Feb 8. Thank you
208-722-6701
» https://www.uidaho.edu/cals/parma-research-and-extension-center
2017 Survey
Landscape and Garden All Locations
Surveys
Posted on: October 23, 2017 by Rich Guggenheim
We are looking for your feedback on the 2017 Pest Alert Network. Please take a few moments of your time to help us improve. Thank you for your time.
