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Spotted Wing Drosophila
Tree Fruits Treasure Valley - Idaho
Spotted Wing Drosophila
Posted on: June 15, 2015 by Jim Barbour
We are getting a few spotted wing drosophila from our traps.
Spotted wing drosophila has been showing up in very small numbers from traps in Payette, Canyon and Owyhee County orchards: only one or two flies per trap per week as of June 9. Populations can grow quickly, so frequent monitoring of susceptible crops is advised. See the attached information for biology and management information. Also, check out the helpful link from the PNW Emerging Pests page.
» http://insect.pnwhandbooks.org/pnw-insect-management-handbook/emerging-pest-spotted-wing-drosophila
Spotted Wing Drosophila
Tree Fruits Treasure Valley - Idaho
Spotted Wing Drosophila
Posted on: June 15, 2015 by Jim Barbour
We are getting a few spotted wing drosophila from our traps.
Spotted wing drosophila has been showing up in very small numbers from traps in Payette, Canyon and Owyhee County orchards: only one or two flies per trap per week as of June 9. Populations can grow quickly, so frequent monitoring of susceptible crops is advised. See the attached information for biology and management information. Also, check out the helpful link from the PNW Emerging Pests page.
» http://insect.pnwhandbooks.org/pnw-insect-management-handbook/emerging-pest-spotted-wing-drosophila
Small Grains Field Days this week - Arbon, Rockland and Rupe
Small Grains All Locations
various pests discussed
Posted on: June 14, 2015 by Juliet Marshall
Please feel free to attend the Cereal Field Tours hosted by the University of Idaho on Wednesday and Thursday!
Rockland and Arbon Valley:
The Cereal Field Day in Power County this year will feature variety plots at both Rockland Valley and Arbon Valley locations on Wednesday, June 17th. The Rockland Valley Field Day will begin at 9:30 a.m. at the plot site on Deeg Road. Head South on Rock Creek Road, and take a right on Deeg road. The plots are about ½ mile on the north side. The Arbon Valley Field Day will begin at 2:00 p.m. at the Hayden Farm. The plots are located on Mid Crystal Road near the Hayden home. Please see the attached map for directions.
Dr. Jianli Chen, University of Idaho Wheat Breeder stationed at Aberdeen, will present potential new spring and winter wheat releases. Dr. Juliet Marshall, Extension Crop Management Specialist, will lead a discussion on cereal disease issues that have come up this year.
Growers in attendance will be encouraged to tour the variety plots at each location. Refreshments will be provided by the Power County Wheat Growers Association.
Rupert Minidoka:
We will be touring both Winter and Spring extension variety Trials, starting at 9:30. Meet at the spring variety trial site - 925 E 700 N. Rupert.
Lunch provided - sponsored by Helena Chemical
Contact Joel Packham at:
Joel Packham;(208) 878-9461 or jpackham@uidaho.edu
Small Grains Field Days this week - Arbon, Rockland and Rupe
Small Grains All Locations
various pests discussed
Posted on: June 14, 2015 by Juliet Marshall
Please feel free to attend the Cereal Field Tours hosted by the University of Idaho on Wednesday and Thursday!
Rockland and Arbon Valley:
The Cereal Field Day in Power County this year will feature variety plots at both Rockland Valley and Arbon Valley locations on Wednesday, June 17th. The Rockland Valley Field Day will begin at 9:30 a.m. at the plot site on Deeg Road. Head South on Rock Creek Road, and take a right on Deeg road. The plots are about ½ mile on the north side. The Arbon Valley Field Day will begin at 2:00 p.m. at the Hayden Farm. The plots are located on Mid Crystal Road near the Hayden home. Please see the attached map for directions.
Dr. Jianli Chen, University of Idaho Wheat Breeder stationed at Aberdeen, will present potential new spring and winter wheat releases. Dr. Juliet Marshall, Extension Crop Management Specialist, will lead a discussion on cereal disease issues that have come up this year.
Growers in attendance will be encouraged to tour the variety plots at each location. Refreshments will be provided by the Power County Wheat Growers Association.
Rupert Minidoka:
We will be touring both Winter and Spring extension variety Trials, starting at 9:30. Meet at the spring variety trial site - 925 E 700 N. Rupert.
Lunch provided - sponsored by Helena Chemical
Contact Joel Packham at:
Joel Packham;(208) 878-9461 or jpackham@uidaho.edu
Iris yellow spot in bulb onions
Onion Treasure Valley
IYSV and Onion thrips
Posted on: June 13, 2015 by Stuart Reitz
Iris yellow spot virus was detected in commercial bulb fields in Payette County.
The advanced symptoms (dried necrotic tissue) seen on some infected plants suggests the infection has been present for at least 2 weeks.
The early appearance of virus points out the need for onion growers to be vigilant in their thrips control programs.
Insecticides won't prevent movement of virus-infected thrips into fields, but can help reduce the secondary spread of virus within fields by reducing plant to plant movement of thrips and their reproduction within the crop.
In addition to thrips management, minimize stress on onion plants by making sure fields are maintained at an adequate but not excessive fertility level, and that the soil moisture is kept at about the 20 centibar level. This will help reduce the severity of virus symptoms.
Please contact Stuart Reitz at Malheur County Extension (541-881-1417 / stuart.reitz@oregonstate.edu) if you have questions about your onion fields or would like assistance with virus diagnosis.
» Developing IYSV lesions on onion (note green islands within necrotic tissue)
Iris yellow spot in bulb onions
Onion Treasure Valley
IYSV and Onion thrips
Posted on: June 13, 2015 by Stuart Reitz
Iris yellow spot virus was detected in commercial bulb fields in Payette County.
The advanced symptoms (dried necrotic tissue) seen on some infected plants suggests the infection has been present for at least 2 weeks.
The early appearance of virus points out the need for onion growers to be vigilant in their thrips control programs.
Insecticides won't prevent movement of virus-infected thrips into fields, but can help reduce the secondary spread of virus within fields by reducing plant to plant movement of thrips and their reproduction within the crop.
In addition to thrips management, minimize stress on onion plants by making sure fields are maintained at an adequate but not excessive fertility level, and that the soil moisture is kept at about the 20 centibar level. This will help reduce the severity of virus symptoms.
Please contact Stuart Reitz at Malheur County Extension (541-881-1417 / stuart.reitz@oregonstate.edu) if you have questions about your onion fields or would like assistance with virus diagnosis.
» Developing IYSV lesions on onion (note green islands within necrotic tissue)
Potato Pest Alert for the week ending 6-12-2015
Potato All Locations
Posted on: June 12, 2015 by Phill Wharton
Pest Alert for the week ending 6-12-2015
Welcome to the new weekly potato disease update for southern Idaho. For the rest of the growing season we will be posting weekly disease updates from around the potato growing regions in southern Idaho.
Dr. Mike Thornton reports that rows are closed/closing in most fields in the Treasure Valley region so growers are focused on late blight/ early blight/ white mold fungicide applications. There have been reports from across the state of some seed lots with relatively high incidences of PVY. With all the excess rain that we had in May, some growers are reporting problems with Fusarium seed piece decay after planting (see http://bit.ly/1FdrZNw for more information).
With the wet May weeds have been more of a problem this spring and are expected to be a problem as the season progresses. Dr. Pam Hutchinson produced a handy article on how to deal with weeds in your potatoes this year (http://bit.ly/1MPv3pq).
The very mild winter we had has also led to a big problem this year with volunteer potatoes showing up across the state (http://bit.ly/1Thgv6p). Volunteer potatoes can harbor diseases such as late blight and increase the risk of a late blight epidemic. For information on what fungicides to use for managing late blight see the article recently published by Dr. Jeff Miller of Miller Research and Dr. Phill Wharton from UI (http://bit.ly/1Q4tmty).
For up to date information on potato diseases in Idaho and across the country follow us on twitter. http://www.twitter.com/potatodiseases
Potato Pest Alert for the week ending 6-12-2015
Potato All Locations
Posted on: June 12, 2015 by Phill Wharton
Pest Alert for the week ending 6-12-2015
Welcome to the new weekly potato disease update for southern Idaho. For the rest of the growing season we will be posting weekly disease updates from around the potato growing regions in southern Idaho.
Dr. Mike Thornton reports that rows are closed/closing in most fields in the Treasure Valley region so growers are focused on late blight/ early blight/ white mold fungicide applications. There have been reports from across the state of some seed lots with relatively high incidences of PVY. With all the excess rain that we had in May, some growers are reporting problems with Fusarium seed piece decay after planting (see http://bit.ly/1FdrZNw for more information).
With the wet May weeds have been more of a problem this spring and are expected to be a problem as the season progresses. Dr. Pam Hutchinson produced a handy article on how to deal with weeds in your potatoes this year (http://bit.ly/1MPv3pq).
The very mild winter we had has also led to a big problem this year with volunteer potatoes showing up across the state (http://bit.ly/1Thgv6p). Volunteer potatoes can harbor diseases such as late blight and increase the risk of a late blight epidemic. For information on what fungicides to use for managing late blight see the article recently published by Dr. Jeff Miller of Miller Research and Dr. Phill Wharton from UI (http://bit.ly/1Q4tmty).
For up to date information on potato diseases in Idaho and across the country follow us on twitter. http://www.twitter.com/potatodiseases
First Lso-positive psyllid found in a potato field in Idaho
Potato All Locations
potato psyllids
Posted on: June 12, 2015 by Erik Wenninger
One of the psyllids (from Ada County) that we found last week in potato fields tested positive for Lso, the bacterium that causes zebra chip. The remaining psyllids that we collected last week tested negative for Lso.
This week we found more psyllids on sticky traps in potato fields in the following counties: Canyon, Ada, Gooding (two different fields), and Twin Falls (two different fields). In addition, suspected potato psyllids from a field in Owyhee County and an additional field in Canyon County are being shipped to us for confirmation, which should occur on Monday.
Last week, in a partnership with ISDA, we inspected for potato psyllids on tomato and pepper plants at four different retail nurseries in the Twin Falls area and found no psyllids. This week we inspected four different retail nurseries in the Burley area and found one tomato plant with many psyllid nymphs. These are being tested for Lso. The importance of retail nurseries in harboring potato psyllids and Lso remains to be clarified, but this is one possible source of the disease.
We continue to urge growers and crop consultants to have an IPM program in place and to begin local monitoring of fields, especially near the recent findings of Lso-positive psyllids.
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
First Lso-positive psyllid found in a potato field in Idaho
Potato All Locations
potato psyllids
Posted on: June 12, 2015 by Erik Wenninger
One of the psyllids (from Ada County) that we found last week in potato fields tested positive for Lso, the bacterium that causes zebra chip. The remaining psyllids that we collected last week tested negative for Lso.
This week we found more psyllids on sticky traps in potato fields in the following counties: Canyon, Ada, Gooding (two different fields), and Twin Falls (two different fields). In addition, suspected potato psyllids from a field in Owyhee County and an additional field in Canyon County are being shipped to us for confirmation, which should occur on Monday.
Last week, in a partnership with ISDA, we inspected for potato psyllids on tomato and pepper plants at four different retail nurseries in the Twin Falls area and found no psyllids. This week we inspected four different retail nurseries in the Burley area and found one tomato plant with many psyllid nymphs. These are being tested for Lso. The importance of retail nurseries in harboring potato psyllids and Lso remains to be clarified, but this is one possible source of the disease.
We continue to urge growers and crop consultants to have an IPM program in place and to begin local monitoring of fields, especially near the recent findings of Lso-positive psyllids.
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
Potato psyllids found in more potato fields and bittersweet
Potato All Locations
potato psyllids
Posted on: June 5, 2015 by Erik Wenninger
The one potato psyllid that we found in a potato field last week tested negative for Lso, the bacterium that causes zebra chip.
This week we found more potato psyllids in potato fields, including one psyllid on a sticky trap in each of five different fields (three in Canyon County, one in Ada County, and one in Jerome County). We also found one psyllid in a vacuum sample from a different Jerome County field.
From our bittersweet nightshade sites, we found 25 potato psyllids from among three of our sites in Twin Falls County and one psyllid from one of our Ada county sites.
This week, in a partnership with ISDA, we inspected for potato psyllids on tomato and pepper plants at four different retail nurseries in the Twin Falls area. Although we had found potato psyllids in nurseries in previous years, we were unable to find any during this inspection.
We continue to urge growers and crop consultants to have an IPM program in place and to begin local monitoring of fields.
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields.
http://www.uidaho.edu/extension/news/psyllid-management
Potato psyllids found in more potato fields and bittersweet
Potato All Locations
potato psyllids
Posted on: June 5, 2015 by Erik Wenninger
The one potato psyllid that we found in a potato field last week tested negative for Lso, the bacterium that causes zebra chip.
This week we found more potato psyllids in potato fields, including one psyllid on a sticky trap in each of five different fields (three in Canyon County, one in Ada County, and one in Jerome County). We also found one psyllid in a vacuum sample from a different Jerome County field.
From our bittersweet nightshade sites, we found 25 potato psyllids from among three of our sites in Twin Falls County and one psyllid from one of our Ada county sites.
This week, in a partnership with ISDA, we inspected for potato psyllids on tomato and pepper plants at four different retail nurseries in the Twin Falls area. Although we had found potato psyllids in nurseries in previous years, we were unable to find any during this inspection.
We continue to urge growers and crop consultants to have an IPM program in place and to begin local monitoring of fields.
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields.
http://www.uidaho.edu/extension/news/psyllid-management
Weed tour at Malheur Experiment Station
Announcements Treasure Valley
weeds
Posted on: June 4, 2015 by Jerry Neufeld
Weed tour at Malheur Experiment Station on Thursday, June 11, 2015
Tour Agenda
Pesticide recertification credits for Oregon (2 hrs) and Idaho (3 hrs) will be issued at the conclusion of the tour. This tour is open to the public. Lunch will be served at the conclusion of the tour.
8:30 – 8:50 AM Registration
Session One
9:00 –10:00 AM
Studies for yellow nutsedge control in dry bulb onion; by Joel Felix
This session of the tour will involve walking through three studies that are being conducted to evaluate yellow nutsedge control in direct-seeded onion.
Onion studies: Evaluate the use of Dual Magnum, EPTAM, and Ethofumesate plow down after wheat harvest to control yellow nutsedge in fields intended for direct-seeded onion production. Evaluate herbicide combinations for weed control in onion.
Session two
10:15 – 11:15 AM
Evaluation of herbicides for weed control in potato and corn; by Joel Felix
This session will showcase a study to evaluate different herbicides for weed control in potato. The study includes several herbicide combinations being evaluated for weed control in potato. A corn study to evaluate herbicides registered for weed control in field corn will be showcased.
Session three
11:20 – 12:20 PM
Herbicides for weed control in sugar beet and direct-seeded onion; by Joel Felix
Tour participants will visit two studies to evaluate different registered herbicides for weed control in sugar beet. The treatments are designed to control glyphosate resistant kochia in sugar beet. The session will also showcase two studies to evaluate onion response to various herbicides applied prior and after onion emergence.
Weed tour at Malheur Experiment Station
All Crops Treasure Valley
weeds
Posted on: June 4, 2015 by Jerry Neufeld
Weed tour at Malheur Experiment Station on Thursday, June 11, 2015?
Tour Agenda
Pesticide recertification credits for Oregon (2 hrs) and Idaho (3 hrs) will be issued at the conclusion of the tour. This tour is open to the public. Lunch will be served at the conclusion of the tour.
8:30 – 8:50 AM Registration
Session One
9:00 –10:00 AM
Studies for yellow nutsedge control in dry bulb onion; by Joel Felix
This session of the tour will involve walking through three studies that are being conducted to evaluate yellow nutsedge control in direct-seeded onion.
Onion studies: Evaluate the use of Dual Magnum, EPTAM, and Ethofumesate plow down after wheat harvest to control yellow nutsedge in fields intended for direct-seeded onion production. Evaluate herbicide combinations for weed control in onion.
Session two
10:15 – 11:15 AM
Evaluation of herbicides for weed control in potato and corn; by Joel Felix
This session will showcase a study to evaluate different herbicides for weed control in potato. The study includes several herbicide combinations being evaluated for weed control in potato. A corn study to evaluate herbicides registered for weed control in field corn will be showcased.
Session three
11:20 – 12:20 PM
Herbicides for weed control in sugar beet and direct-seeded onion; by Joel Felix
Tour participants will visit two studies to evaluate different registered herbicides for weed control in sugar beet. The treatments are designed to control glyphosate resistant kochia in sugar beet. The session will also showcase two studies to evaluate onion response to various herbicides applied prior and after onion emergence.
UI Snake River Pest Management Research Tours
All Crops All Locations
Posted on: June 2, 2015 by Don Morishita
Please join us for our annual pest management tours coming up on June 23rd at the UI Kimberly R&E Center and June 24th at the UI Aberdeen R&E Center. Registration for both events begins at 8:00 am and the tour will start at 8:30 am. An industry sponsored lunch will be held at noon at both locations. Below is an agenda for each day. Our contact information also is listed below.
UI Snake River Pest Management Research Tours
Kimberly R&E Center, 3806 N. 3600 E., Kimberly, ID- June 23rd
Aberdeen R&E Center, 1693 S 2700 W Aberdeen, ID- June 24th
Registration begins at 8:00 am
UI Snake River Pest Management Research Tour- Kimberly R&E Center, 6/23/15
8:20 to 8:30
Greetings, introductions and announcements
8:30 to 12:00
Turf-
Field bindweed and other weed management in bluegrass turf with herbicides and fertilizer
Sugar beets-
Effect of tillage and fertility rate on insect and weed management in sugar beet
Soil-active herbicides for weed control in direct seed and strip till sugar beet
Evaluation of chloroacetamide and glyphosate tank mixtures for weed control in sugar beet
Insecticide seed treatment leaf miner study
Beet and root Aphid insecticide trial
Potatoes-
Update on weed management in potato
Colorado potato beetle trials-
ISK and Monsanto
General insecticide trial focused on potato psyllids- PNW Potato Research Consortium
Potato psyllid & zebra chip insecticide trial.
Timing and density of psyllid infection on zebra chip development
Wireworm insecticide trial
Silver scurf, phytosanitary tool for export using CIPC
PVY and other emerging viruses
Zebra chip disease in potato.
Potato variety storage research- varieties from the tri-state potato breeding program.
Cereals-
Wheat insect pest management update in small grains and other crops
Comparison of triallate with other wild oat herbicides for wild oat control and crop safety in spring wheat
Comparison of triallate with broadleaf herbicides for weed control and crop safety in spring wheat
Comparison of herbicides for broadleaf weed control and crop safety in spring wheat
Comparing broadleaf and wild oat herbicides in spring wheat
Dry beans-
Dry bean row spacing, plant growth habit and herbicides for season-long weed control
Preplant and postemergence herbicides for weed control in furrow-irrigated dry bean
Time of day effects on Basagran for weed control in dry bean.
Use of adjuvants with Basagran for weed control in dry bean.
Preemergence and postemergence herbicides for weed control in sprinkler-irrigated dry bean
Field corn-
Weed control in field corn with pre- and postemergence herbicides
Alfalfa-
Alfalfa seed coating for disease management and stand establishment.
Vole damage management in alfalfa.
For more information contact Don Morishita (don@uidaho.edu), at 208.423.6616.
Aberdeen R&E Center Weed Tour
UI Snake River Pest Management Research Tour- Kimberly R&E Center, 6/23/15
8:20 to 8:30
Greetings, introductions and announcements
8:30 to 12:00
Weed control in potato with 2- and 3-way tank mixtures,
Potato variety tolerance to herbicides
Eptam formulations rate and timing
Weed control in Litchi tomato (PCN trap crop).
Updates from Juliet Marshall, Phill Wharton, and Arash Rakesh on disease and insect infestations this year
Cropping systems study- Xi Liang
For more information contact Pam Hutchinson (phutch@uidaho.edu), 208.397.4181.
Potato Pest Update
Potato Treasure Valley
Colorado potato beetle & Potato psyllid
Posted on: June 2, 2015 by Stuart Reitz
1) Dr. Mike Thornton reports that adult Colorado potato beetles are being found on volunteer plants in the Treasure Valley. They have not yet been seen in commercial fields, but this is the time of year that growers should be out actively scouting field edges for insects. This is especially true if fields did not receive an at-planting insecticide application.
2) A single potato psyllid adult was captured on a sticky trap in Malheur County. Potato growers in the Treasure Valley are encouraged to closely monitor their fields. For management information, please see: http://www.uidaho.edu/extension/news/psyllid-management/recommendations or contact your local extension office.
First 2015 potato psyllid found in ID potato field & first 2
Potato All Locations
potato psyllids and ZC
Posted on: May 29, 2015 by Erik Wenninger
We collected our first samples from potato fields this week, and found a potato psyllid on a sticky trap in a field in Twin Falls County. This is the first psyllid we’ve found in a potato field this season and the only one we’ve found in potato so far this week (though we are waiting to receive cards for several sites).
In addition, of the 8 adult psyllids we collected last week from bittersweet nightshade in Twin Falls County, three (one each from three different sites in the canyon) tested positive for Lso, the bacterium that causes zebra chip. This is the first time that we have ever found positive psyllids from our bittersweet nightshade samples.
Given that this is the earliest we have ever found potato psyllids in potato and the first time we have ever found positive psyllids from bittersweet nightshade, we strongly urge growers and crop consultants to have an IPM program in place and to begin local monitoring of fields.
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields.
http://www.uidaho.edu/extension/news/psyllid-management
Stripe Rust Alert (Wheat) and Spot Form of Net Blotch (Barle
Small Grains All Locations
Stripe rust and Spot Form of Net Blotch
Posted on: May 27, 2015 by Juliet Marshall
Spring and Winter Wheat
1) Stripe rust
Stripe rust is being reported from a widespread area, including northern Utah, western Idaho, southern Idaho (Twin Falls and Burley / Rupert area) and now eastern Idaho (Newdale and Blackfoot).
All reports so far have been in Brundage soft white winter wheat.
Brundage is very susceptible. If you have not be applying fungicides to this variety up to now, I would consider it infected and treat with a triazole fungicide which has some curative activity.
Strobilurin products may have reduced efficacy on stripe rust if the plants are already infected.
The Pre-Harvest Interval (PHI) has been reached in some winter wheat production at which time it is too late to apply fungicides. Always follow label directions.
Spray appropriate fungicides on susceptible spring wheat varieties at herbicide application.
2) BYD
Barley yellow dwarf symptoms are re-occurring in infected fields. Expect to see flag leaves with the typical yellow and red “flags”. For more information, see http://www.uidaho.edu/extension/cereals/scseidaho and click on publications to download the BYD bulletin published by the UI. The heavy rains have really helped to mitigate the damage.
3) RWA
Russian Wheat Aphids are damaging wheat in several areas - look for white (bleached) stripes on tightly curled leaves, and trapped heads which appear similar to frost damaged heads. We are seeing frost damage (which is the likely cause in the picture below) and RWA damage in wheat. RWA will colonize both wheat and barley.
Winter and Spring barley
1) BYD problems may resurface as plants begin to head. Expect to see flag leaves with the typical yellow and red “flags”. For more information, see http://www.uidaho.edu/extension/cereals/scseidaho and click on publications to download the BYD bulletin published by the UI. The heavy rains have really helped to mitigate the damage from the virus.
2) SFNB = Spot Form of Net Blotch is showing in barley fields, especially if the field has second year crops or has infected residue from the previous year. The disease can also survive on grassy weeds and volunteer barley, and be spread by infected seed. Use full strength fungicides for control when spraying herbicides for weed control.
» http://www.uidaho.edu/extension/cereals/scseidaho
2015 Potato psyllid monitoring program underway
Potato All Locations
potato psyllids
Posted on: May 22, 2015 by Erik Wenninger
The University of Idaho, in collaboration with Miller Research and several crop consultants across the state is continuing our monitoring program for potato psyllids, zebra chip, and liberibacter (Lso), the bacterium that causes zebra chip.
Monitoring on 17 of our “Light” sites began last week (all in the Treasure Valley) and 4 of our “Intense” sites (all in the Magic Valley) with the deployment of sticky cards. We found no potato psyllids on cards at any of these sites this week. Deployment of sticky cards began on many more sites this week as well. We expect to have a total of around 75 “Light” sites and 13 “Intense” sites across the state; this is similar to last year.
Online spreadsheets showing details of the psyllid captures in potato fields will go live next week.
We have been monitoring for psyllids within presumed overwintering habitat, including bittersweet nightshade and field bindweed sites, and we found 8 adult potato psyllids and many nymphs on bittersweet nightshade this week in Twin Falls County (no psyllids were found in Treasure Valley sites this week). These psyllids are now in transit to Moscow to be tested for Lso.
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
test email
All Crops Treasure Valley
this is a test email
Posted on: May 22, 2015 by Jerry Neufeld
We are testing the system. Sorry for the inconvenience, but I hope you have a good weekend!
Weed management in potatoes
Potato All Locations
Weeds
Posted on: May 21, 2015 by Pam Hutchinson
I’ve had many calls about weed control in potatoes because of high rainfall amounts, excessive soil moisture this spring.
Please see the attached WORD document for my thoughts on what may happen - what are the possibilities for weed control in potatoes due to these conditions.
Western Cherry Fruit Fly Treatment Forecast
Tree Fruits Treasure Valley
Western Cherry Fruit Fly
Posted on: May 21, 2015 by Paul Castrovillo
According to the degree-day model from the Online Phenology and Degree-Day Models published at the OSU Integrated Plant Protection Center Website the forecasted dates for beginning treatment against Western Cherry Fruit Fly are: Ontario (May 25), Caldwell (May 29), Boise and Parma (June 4), Nampa (June 5) and Emmett (June 9). These are based on recommended first treatment at 1060 degree-days per "Orchard Pest Management" as published by the "Good Fruit Grower", Yakima 1993.
The first Idaho Western Cherry Fruit Fly for 2015 was recently found in a trap in Homedale on May 19.
Iris yellow spot in volunteer onions
Onion Treasure Valley
Iris Yellow Spot / Onion thrips
Posted on: May 21, 2015 by Stuart Reitz
Several volunteer onions with Iris yellow spot virus (IYSV) have been found this week in Malheur County. Volunteer onions can serve as a source 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.
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.
Coddling Moth Timing
Tree Fruits All Locations
Coddling Moth
Posted on: May 19, 2015 by Tony McCammon
Wilbur Ellis Spray Scheduling for this week:
Fruitland/Payette May 24th 350 DD
Parma/ Roswell May 23rd 350 DD
SunnySlope May 23rd 350 DD
Magic Valley May 25 350 DD
Pocatello May 30 350 DD
Rexburg June15 350 DD
Onion Bulb Mites
Onion Treasure Valley
Onion Bulb MIte
Posted on: May 15, 2015 by Stuart Reitz
Onion bulb mites have been found in several onion fields across the Treasure Valley. So far numbers appear to be low but they may be a contributing factor to stand losses.
Bulb mites can overwinter in the soil on decomposing vegetation or on volunteer onions in the field and in cull piles. Mild winter weather may have reduced their natural overwinter mortality.
Management relies on preventative measures, such as field sanitation and fumigation of fields with a history of problems.
If you have questions or concerns about onion bulb mites, please contact Stuart Reitz, Malheur County Extension, 541-881-1417, stuart.reitz@oregonstate.edu.
