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Iris yellow spot virus in Volunteer Onions
Onion All Locations
Iris yellow spot virus / onion thrips
Posted on: May 28, 2016 by Stuart Reitz
Iris yellow spot virus (IYSV) was detected in volunteer onions in the Ontario, OR area. Characteristic necrotic, diamond-shaped lesions were found on flower scapes. Volunteer onions can serve as a source of virus-infected thrips to move into this season's onion crop.
Although the virus has not yet been found in this season's bulb fields, please continue to monitor fields carefully for thrips. Thrips populations have grown substantially over the past week, and the high temperatures forecast for later next week will further increase thrips development and population growth.
Reducing overall stress on onions will help reduce the severity of damage from thrips and virus
If you see potentially symptomatic plants that you would like tested for virus or have questions about thrips and the virus, please contact Stuart Reitz, Malheur County Extension, 541-881-1417.
First potato psyllids found in Idaho potato fields this season
Potato All Locations
potato psyllids
Posted on: May 27, 2016 by Erik Wenninger
May 27, 2016 – First potato psyllids found in Idaho potato fields this year
We collected our first potato psyllids of the season from sticky cards in Idaho potato fields. Two psyllids were found – one in each of two potato fields in Canyon County. We found our first potato psyllids at a similar time last year.
Sticky cards have now been deployed in 66 of the estimated 97 fields that will be included in the monitoring program this year.
We urge growers and crop consultants to have an IPM program in place. More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://www.uidaho.edu/extension/news/psyllid-management
Detailed results from the "Light" sites (from which the two psyllids were found) can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
Detailed results from the "Intense" sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
» http://www.uidaho.edu/extension/news/psyllid-management
» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
“Heads up” for Volunteer Potato Control in other crops.
All Crops All Locations
Posted on: May 26, 2016 by Phillip Wharton
With the very mild winter weather conditions this year a lot of volunteer potatoes survived over winter. Growers are now seeing a lot of problems with volunteer potatoes in other crops such as corn, sugar beet, wheat and onions. Volunteer potatoes can be very hard to eliminate if the correct control measures are not taken at the most appropriate time. The potato tuber initiation stage has been shown to be the best time for herbicide application in order to kill the volunteer potato plant, prevent re-sprouting, and prevent tuber production. Attached, Dr. Pamela Hutchinson, Potato Cropping Systems Weed Scientist, has put together a great article on methods for controlling volunteer potatoes in other crops.
Clarification on “New strain of Tomato Late Blight detected in Idaho”
All Crops All Locations
late blight
Posted on: May 26, 2016 by Phillip Wharton
A point of clarification on the announcement that a “New strain of Tomato Late Blight detected in Idaho”: Late blight has NOT been found in Idaho this year yet in either tomatoes or potatoes. The strain of late blight referred to in the announcement is not new as it has been found in tomatoes and potatoes in 2013, 2014 and 2015, with a widespread outbreak in potatoes throughout SE Idaho last year. The purpose of the leaflet linked to in the previous announcement is to make home owner’s and growers aware of the potential threat of tomato late blight in home owners tomatoes to commercial potato fields. This is because the risk of an outbreak of late blight in potatoes this year is high due to the current cool wet weather and the potential that the late blight pathogen was able to over winter in volunteer potatoes due to the very mild winter conditions. For more information see http://bit.ly/1XSWHsS
New strain of Tomato Late Blight detected in Idaho.
Landscape and Garden All Locations
Late Blight in Tomatoes.
Posted on: May 25, 2016 by Rich Guggenheim
Late blight in tomatoes will likely be seen again this year in Idaho. There is a new highly infectious strain in Idaho this year, US23 which is pathogenic both to tomatoes and potatoes, and some research suggests even petunias.
Application of fungicides in the home garden are preventative only and not curative. Best management practices include avoiding water on leaves of plants and removing infected plants which may spread the disease.
Some varieties are resistant to late blight.
For more information, contact your local County Extension Office!
» http://www.ipm.ucdavis.edu/PMG/r783100211.html
» http://extension.oregonstate.edu/gardening/be-lookout-symptoms-tomato-late-blight
» https://extension.umaine.edu/publications/2427e/
» http://www.plantpath.wisc.edu/wivegdis/pdf/2015/Organic%20late%20blight%20control%202015.pdf
Update of potato psyllid monitoring in Idaho - 20 May 2016
All Crops All Locations
potato psyllids
Posted on: May 20, 2016 by Erik Wenninger
This week we collected our first sticky cards of the season from potato fields. No potato psyllids were found in potato fields this week. Sticky cards had been deployed in only 27 of the estimated 96 fields that will be included in the program this year, but quite a few more sites were established this past week.
More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://www.uidaho.edu/extension/news/psyllid-management
Paul Castrovillo "First 2016 Western Cherry Fruit Flies Captured in ISDA Monitor Trap"
All Crops All Locations
Western Cherry Fruit Fly
Posted on: May 20, 2016 by Rich Guggenheim
Now is the time to begin treatment for WCFF.
Four specimens of Western Cherry Fruit Fly (Rhagoletis indifferens) were found in an Idaho State Department of Agriculture WCFF survey trap in Canyon County that was checked on May 16. These were the first specimens captured in 2016. Our traps in Gem County, checked the same day, contained no WCFF, however, historically we expect to find them there about a week after the initial catch in Canyon County.
Please check with your local county extension educator or crop consultant for the situation in your area and for proper chemical recommendations and application methods if necessary.
» http://jenny.tfrec.wsu.edu/opm/displaySpecies.php?pn=150
» http://wci.colostate.edu/Assets/pdf/western.cherry.fruit.fly.pdf
» https://extension.usu.edu/files/publications/factsheet/western-cherry-fruit-flies06.pdf
First 2016 Western Cherry Fruit Flies Captured in ISDA Monitor Trap
Cherry All Locations
Western Cherry Fruit Fly
Posted on: May 20, 2016 by Paul Castrovillo
Four specimens of Western Cherry Fruit Fly (Rhagoletis indifferens) were found in an Idaho State Department of Agriculture WCFF survey trap in Canyon County that was checked on May 16. These were the first specimens captured in 2016. Our traps in Gem County, checked the same day, contained no WCFF, however, historically we expect to find them there about a week after the initial catch in Canyon County.
Now is the time to begin treatment for WCFF.
Please check with your local county extension educator or crop consultant for the situation in your area and for proper chemical recommendations and application methods if necessary.
Fire Blight on Apple and Pear Trees
Tree Fruits All Locations
Fire Blight
Posted on: May 18, 2016 by Dian Roberson
We are seeing a lot of fire blight on pears come into the Canyon County Extension Office! Fire blight is a bacterial disease that affects certain species in the rose family (Rosaceae). It is especially destructive to apples (Malus spp.), pears (Pyrus spp.), and crabapples (Malus spp.). It likes warm wet springs like the one we had this year. There is no cure for fire blight. Prevention is the best solution. Purchase resistant varieties, minimize rapid growth and succulent tissue, prune out blighted twigs and cankered branches. Check out the publications and websites below for more information.
» http://pnwhandbooks.org/plantdisease/pear-pyrus-spp-fire-blight
2016 Potato psyllid monitoring program underway in Idaho
Potato All Locations
potato psyllids
Posted on: May 13, 2016 by Erik Wenninger
The University of Idaho, in collaboration with Miller Research and several crop consultants across the state will continue our monitoring program for potato psyllids, zebra chip, and liberibacter (Lso), the bacterium that causes zebra chip. The monitoring program covers commercial potato fields throughout southern Idaho and is funded in part by IPC, USDA, and generous in-kind contributions by our collaborators.
The first deployment of sticky cards on several of our sites occurred during the past week. More details on the program will be forthcoming, but it will be similar to what we’ve done over the last three years.
More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://www.uidaho.edu/extension/news/psyllid-management
Stripe rust in wheat and barley
Small Grains All Locations
stripe rust of wheat
Posted on: May 13, 2016 by Juliet Marshall
Stripe rust continues to spread and is now affecting susceptible spring wheat (UI Pettit) as well as winter wheat. From Oregon to Eastern Idaho, be prepared to apply fungicides to susceptible and moderately susceptible varieties. The fungi infect, take a week or two to develop, and suddenly stripe rust pustules appear seemingly overnight. The application of triazole fungicides are critical in reducing the impact on crops that are already infected, so triazoles and mixed mode of action fungicides are needed to stop the fungi in fields that already have infections. Click on the Cereals Project link to access a Fungicide Efficacy Table and more information about this disease.
Stripe rust in barley has been reported - but at low levels and in one field. This is a different strain, and stripe rust of wheat does not cause stripe rust in barley. Scout fields of wheat and barley, and report occurrence, location and variety to me at jmarshall@uidaho.edu. Thank you to all who have sent me pictures and outbreaks!
Stripe rust in Malheur County
Wheat Northern Idaho
Stripe Rust
Posted on: May 12, 2016 by Bill Buhrig
Stripe rust is being observed in wheat fields between Nyssa and Ontario. This falls in line with previous discoveries of stripe rust in neighbors areas including at the Parma R and E Center. As Juliet Marshall (U of I Aberdeen) suggests, weekly scouting is key and working with your crop consultant is important. Please see the link to the PNW Disease Handbook for more information.
» http://pnwhandbooks.org/plantdisease/wheat-triticum-aestivum-stripe-rust-yellow-rust
Stripe Rust in Parma Area
Wheat Treasure Valley
stripe rust
Posted on: May 11, 2016 by Jerry Neufeld
Dr. Oliver Neher (AMSCO Pathologist) and Dr. Olga Walsh (UI Parma Research and Extension Center) have found and confirmed stripe rust in the winter wheat nursery plots at the University of Idaho, Parma R&E Center.
Below is information Dr. Juliet Marshall (University of Idaho Cereals Extension Specialist) posted on this website regarding stripe rust a few days ago.
I highly recommend that anyone with a field of Brundage examine it closely for stripe rust, looking especially at lower leaves that could have been infected last fall. Snow cover protects wheat as well as the stripe rust from freezing temperatures. Fields that have been under snow will serve as good reservoirs for stripe rust to carry into our spring wheat.
All susceptible varieties should be scouted weekly from now on. Please report infected fields (the approximate location) and send pictures so I can keep alerts updated as the season progresses (jmarshall@uidaho.edu). This helps everyone!
Strobilurin fungicides are excellent preventative fungicides, as are triazoles. Triazoles (or triazole and strobilurin mixes) are more effective if there is a field with established infections. The attached table is (not a complete) list of fungicides put together by a group of pathologists belonging to the NCERA-184, with ratings for degree of control of several wheat diseases.
At this point:
1) Spray fungicides at herbicide timing on susceptible varieties of winter wheat.
2) Select resistant spring varieties, if possible.
3) Be prepared to spray susceptible winter and spring varieties as needed to protect from yield loss - this may be two or more applications of fungicides during the growing season.
4) Scout ALL varieties as there are sometimes changes in the fungal strains, and those varieties that are currently resistant may become susceptible if there are race changes in the fungi.
The use of resistant varieties is the most sustainable and economically viable method of stripe rust control. Breeders work hard to develop resistant varieties in order to help growers save input costs. It is not necessary to spray resistant varieties – in fact, not spraying resistant varieties will contribute to longer-term effectiveness of available fungicides.
» http://www.uidaho.edu/extension/cereals/scseidaho
» http://pnwpestalert.net/uploads/Stripe_Rust_Alert_4-5-16.pdf
» http://pnwpestalert.net/uploads/NCERA_184_Wheat_fungicide_table_2016_V1.pdf
May 9th Tree Fruit Pest Advisory
Tree Fruits All Locations
Codling Moth, Aphids, Fire Blight, Thinning
Posted on: May 9, 2016 by Tony McCammon
Codling moth is in early hatch for most of Southwestern Idaho. Southern and Eastern Idaho are not far behind. open the attached pest advisory for more information on Codling moth management.
Wildflower Day is May 12th at the Malheur Experiment Station!
All Crops All Locations
Posted on: May 2, 2016 by Bill Buhrig
Everyone is invited to attend the Native Wildflower Seed Production Field Day at the Malheur Experiment Station on May 12. Registration starts at 8am and lunch will be served. The flier is attached with more details. It is requested that attendees RSVP so we can get a head count for lunch. Call 541-889-2174 to RSVP or ask any questions you may have. It will be a good time!
Codling Moth at 310 Degree Days
Landscape and Garden Treasure Valley
Codling Moth
Posted on: May 2, 2016 by Rich Guggenheim
Codling Moth Degree Days have reached 310 DD
The peak egg hatch period has begun. Chemical sprays loose effectiveness quickly on expanding fruits . It is important that your fruit is protected with insecticide to prevent larval entry. Keep track of when your first treatment was applied and how long it lasts. If it is waning during the period of peak egg hatch, consider applying your second application sooner (by 1-2 days).
Insecticides that target both larva and egg stages are recommended. Such as: Altacor, Assail, Calypso, and Intrepid. Homeowners should use horticulture oil with a product such as sevin for their first spray. The oil will smother unhatched eggs and the sevin will protect the fruit from hatched larva. Good residue coverage on your fruit is vital during the first generation.
Read and follow all label instructions when applying pesticides. If you use a pyrethroid based insecticides, chose a different class pesticide for your second spray, such as Assail, Calypso, Intrepid, or Imidan. Insects develop resistance to pyrethroids very quickly.
» http://extension.usu.edu/files/publications/factsheet/codling-moths06.pdf
» http://jenny.tfrec.wsu.edu/opm/displayspecies.php?pn=5
» http://www.ipm.ucdavis.edu/PMG/r4300111.html
» http://extension.colostate.edu/topic-areas/insects/codling-moth-control-in-home-plantings-5-613/
Aphids
Landscape and Garden All Locations
Aphid
Posted on: April 28, 2016 by Dian Roberson
Aphids are being reported on succulent new spring growth of a variety of landscape plants from Apple trees to Lupine. Remember, a stiff spray of water could be all it takes to reduce or eliminate populations. Check plants closely for Ladybug Larvae and other predators before taking action with chemicals. Nature may already be on the job!
» http://insect.pnwhandbooks.org/hort/nursery/common/nursery-crop-pests-aphids
» http://insect.pnwhandbooks.org/tree-fruit/apple/apple-woolly-apple-aphid
» http://extension.oregonstate.edu/gardening/how-control-aphids-less-toxic-methods
» https://www.facebook.com/journal.environmental.agricultural.sciences/videos/939087619502267/?fref=nf
Beet Leafminer in Spinach, Swiss Chard and Garden Beets
Landscape and Garden All Locations
Posted on: April 27, 2016 by Ariel Agenbroad
Notice small white clusters of eggs on the backsides of your spinach, beet and Swiss Chard plants? Or are the leaves showing damage that looks papery or like winding trails? Then you're probably hosting the tiny fly Beet Leafminer.
You have several options, prevention, cultural management, and both organic and synthetic chemical treatments.
See http://insect.pnwhandbooks.org/vegetable/vegetable-pests/hosts-and-pests/beet-table-leafminer for more information on how to identify the damage and manage this pest.
» http://insect.pnwhandbooks.org/vegetable/vegetable-pests/hosts-and-pests/beet-table-leafminer
sugarbeet root maggot, 2017
Sugarbeets Treasure Valley
sugarbeet root maggot
Posted on: April 26, 2016 by Jerry Neufeld
The degree day calculator (hosted by the Integrated Plant Protection Center at Oregon State University; http://uspest.org/cgi-bin/ddmodel.us) for the sugar beet root maggot fly shows that—depending on your location in the Treasure Valley—we have accumulated nearly 360 growing degree days since January 1, 2017. Peak flight of root maggot flies should occur after 360 accumulated growing degree days when the maximum high temperature exceeds 80 degrees F. In the Treasure Valley this will be very soon.
Root maggot flies will lay eggs near sugarbeet plants. After the larvae hatch they will begin feeding on the young sugarbeets. Look for these pests to appear in the western end of the Treasure Valley first. If you haven’t applied a treatment for sugarbeet root maggot, now is the time to do so. The link below from the 2017 PNW Insect Management handbook contains additional information. Visit with your field consultant from AMSCO for treatment options.
» https://pnwhandbooks.org/insect/agronomic/sugar-beet/sugar-beet-sugar-beet-root-maggot
» http://uspest.org/cgi-bin/ddmodel.us
» sugarbeet root maggot larvae
Parma/Malheur Cropping Systems Agronomy Field Day - JUNE 20, 8:30 AM
All Crops Treasure Valley
Posted on: April 25, 2016 by Olga Walsh
Contact information: Olga Walsh (University of Idaho, Parma R&E Center): owalsh@uidaho.edu; Bill Buhrig (Oregon State University, Malheur ES): William.Buhrig@oregonstate.edu
LOCATION: University of Idaho, Parma R&E Center, 29603 U of I Lane, Parma, ID, 83660.
Time Activity
8:30 am – 9:00 am Registration
9:00 am – 12 noon Touring the experimental plots/demos
12:00 noon – 1 pm Lunch/indoor presentations
Crops/topics covered: winter & spring wheat, beans, corn, fresh peas/mustard/wheat rotations, nutrient management, water management, weed management, unmanned aerial vehicles, crop sensors. Detailed information will follow shortly.
Please consider to attend/present and spread the word about the field day.
Alfalfa and Cabbage Looper
All Crops All Locations
Alfalfa Looper
Posted on: April 23, 2016 by Rich Guggenheim
Alfalfa Looper is being seen throughout the area. They are similar in appearance to Cabbage looper. The major damage caused by larvae and pupae is contamination of the heads of cole crops and processed foods, and defoliation of peas, alfalfa, beans, mint, and spinach.
» http://horticulture.oregonstate.edu/content/cabbage-looper-alfalfa-looper
» http://www.ipm.ucdavis.edu/PMG/r114300711.html
Weevil in Forage Alfalfa
Alfalfa Northern Idaho
Weevil
Posted on: April 20, 2016 by Bill Buhrig
Weevil are being found in forage alfalfa fields in Malheur County. They are more likely to be approaching damage thresholds in older stands. Please refer to the attached link for more information and work with your crop consultants to determine if a treatment is necessary. Be aware of pre-harvest intervals and how they may interfere with your timing when swathing first cutting. In some instances, swathing may make more sense than applying a plant protectant product.
» http://insect.pnwhandbooks.org/hay-pasture/alfalfa/alfalfa-hay-alfalfa-weevil
Dig In Newsletter
All Crops All Locations
Posted on: April 19, 2016 by Rich Guggenheim
Check out the Spring edition of the Dig In Newsletter:
May ISDA Pesticide Disposal Program
All Crops All Locations
Posted on: April 19, 2016 by Rich Guggenheim
The Idaho State Department of Agriculture is conducting a pesticide disposal program May 9 at Pickles Butte Landfill. 15500 Missouri Ave, Nampa. May 10 at the ITD Maintenance Yard. 550 Indian Head Rd, Weiser. Collection times are 9 am to 1 PM both days.
Lygus Emergence in Alfalfa Seed
Alfalfa Seed Treasure Valley
lygus bug
Posted on: April 19, 2016 by Jerry Neufeld
Thanks to Dr. Jim Barbour, IPM Specialist at the University of Idaho, SW Idaho Research and Extension Center (Parma) for providing this information about Lygus emergence in alfalfa seed.
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition (http://pnwpest.org/cgi-bin/ddmodel.pl?spp=lyg) shows that, depending on your location in the Treasure Valley, we have accumulated 137 degree days between January 1, 2016 and April 19, 2016. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days: this usually occurs around mid-May, and is the time monitoring for lygus bugs in alfalfa seed fields should begin. Right now peak emergence is predicted to occur about the first week of May ( ~May 5). This is about 8 days ahead of the 30 year average.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Assail, or Beleaf, as stand-alone sprays probably should treat before 4th instar nymphs are detected. You can monitor degree day accumulation using the link provided above as follows:
1) Select the location nearest you by selecting the appropriate pin in the map at the top of the page. The above data are for the Parma location. Results likely will vary depending on the location selected.
2) Select “insects” in the category drop down box under the map, then select the “Lygus bug [alfalfa seed] Ben Simko 2000” model from the “model Parma” drop down box.
3) The predicted date for the 275 degree day accumulation for peak 1st and 2nd instar lygus nymphs will be listed in the “DDs Event” text box. You also can view the full model output by selecting the button labeled “Click here to CALC/ RUN model w/daily output.”
