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Psyllid update 7 September 2018
Potato All Locations
Potato Psyllid
Posted on: September 7, 2018 by Lucy Standley
Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (2 fields), Twin Falls (1 field), and Cassia (4 fields).
This week, we collected 19 psyllids from sticky cards (across 4 light sites and 3 intense sites).
We had traps deployed in all 32 of the 32 fields (100%) monitored and found psyllids in 7 of the monitored fields (21.8%). 63 of the 95 total fields that we were sampling have been vine-killed.
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. With only two Lso-positive psyllids found to date, percent incidence is currently considerably lower than in most previous years. Nevertheless, we urge growers and crop consultants to have an IPM program in place.
“Heat maps” of this week’s results will be included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho
» http://www.uidaho.edu/cals/potatoes/news
Powdery Mildew Outbreak
Landscape and Garden Treasure Valley
Powdery Mildew
Posted on: September 6, 2018 by Maria Held
Powdery mildew has been observed on squash, zucchini and carrots. It affects almost any type of plant including ornamentals such as peony, lupine and pansies.
Powdery mildews are characterized by spots or patches of white to grayish, talcum-powder-like growth.
It grows readily in our warm and dry climate. When available choose resistant or tolerant varieties. The disease is common in crowded plantings where air circulation is poor and in damp, shaded areas. Avoid overhead irrigation and late summer application of nitrogen fertilizer once symptoms occur. Remove and destroy all infected plant parts (leaves, etc.). Do not compost infected plant debris. Temperatures often are not hot enough to kill the fungus.
Chemicals are most effective when combined with cultural controls.
» http://extension.colostate.edu/topic-areas/yard-garden/powdery-mildews-2-902/
Idaho Association of Plant Protection 2018 Annual Meeting
All Crops All Locations
Posted on: September 5, 2018 by Jeff Miller
This is an invitation and call for papers for the 2018 annual meeting of the Idaho Association of Plant Protection in Twin Falls, ID at the Canyon Crest Dining and Event Center. The conference will cover all aspects of plant protection including entomology, nematology, weed science and plant pathology.
Please consider contributing research results, observations, unusual pest and disease occurrences, and topics which could be discussed as a group, etc. to the meeting. Each presentation will be allotted at least a 20-minute time slot. A final program will be advertised in October. Registration begins at 12:30 p.m. on Wednesday and the program will begin at 1:00 p.m. Registration costs $15.00 and can only be made by check or cash. Certified Crop Advisor (CCA) and Pesticide Recertification credits (ISDA) will be available.
Hotel reservations must be made on your own.
Please see the attached sheet to submit a topic for presentation.
Psyllid update 31 August 2018
Potato All Locations
Potato Psyllid
Posted on: August 31, 2018 by Lucy Standley
Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (9 fields), Owyhee (2 fields), Elmore (1 field), Payette (1 field), Jerome (1 field) Twin Falls (2 fields), and Cassia (1 field).
This week, we collected 34 psyllids from sticky cards (across 13 light sites and 4 intense sites).
We had traps deployed in all 89 of the 89 fields (100%) monitored this year and found psyllids in 17 of the monitored fields (19.1%). Six of the 95 total fields that we were sampling have been vine-killed.
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. With only two Lso-positive psyllids found to date, percent incidence is currently considerably lower than in most previous years. Nevertheless, we urge growers and crop consultants to have an IPM program in place.
“Heat maps” of this week’s results will be included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho
» http://www.uidaho.edu/cals/potatoes/news
Unmanned Aerial Vehicle (UAV) field demonstration
All Crops All Locations
Posted on: August 30, 2018 by Olga Walsh
Date, time: September 13, 2018 9 am – 12 noon
Location: Reggear Tree Farm, 1415 Shortcut Rd, Craigmont, ID 83523
Come learn about how drones can be used in agriculture, crop production, nursery industry and more. University of Idaho specialists will share their latest research and answer questions related to UAVs.
Please forward to those who may be interested.
Thank you to our host: Mr. Bob Reggear!
Organizing committee: Dr. Olga Walsh, Dr. Esmaeil Fallahi, Dr. Sanaz Shafian
This event is funded by: Idaho Department of Agriculture, Idaho Nursery & Landscape Association, University of Idaho Extension, Idaho Agricultural
Experiment Station
Contact information: Olga Walsh, Assistant Professor, Cropping Systems Agronomist, University of Idaho, Parma R&E Center, owalsh@uidaho.edu
Psyllid update 24 August 2018
Potato All Locations
Potato Psyllid
Posted on: August 24, 2018 by Lucy Standley
Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (10 fields), Elmore (1 field), Twin Falls (2 fields), and Cassia (1 field).
This week, we collected 30 psyllids from sticky cards (across 9 light sites and 5 intense sites).
We had traps deployed in all 95 of the 95 fields (100%) monitored this year and found psyllids in 14 of the monitored fields (14.7%).
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. With only two Lso-positive psyllids found to date, percent incidence is currently considerably lower than in most previous years. Nevertheless, we urge growers and crop consultants to have an IPM program in place.
“Heat maps” of this week’s results will be included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho
» http://www.uidaho.edu/cals/potatoes/news
Malheur Experiment Station Onion Variety Day August 28
All Crops All Locations
Posted on: August 21, 2018 by Janet Jones
You are invited to the Malheur Experiment Station Onion Variety Day!
Place: Malheur Experiment Station, 595 Onion Ave, Ontario, OR
in the field off Onion Avenue under the canopy.
Date: Tuesday, August 28, 2018
Registration starts at 9:00am with donuts and refreshments.
A complimentary lunch will be served at noon.
Click on the PDF below for the Flyer.
Please RSVP for lunch or if you need more information call Jan Jones at (541) 889-2174 or email janet.jones@oregonstate.edu.
Sunscald in peppers and tomatoes
Landscape and Garden Treasure Valley - Idaho
Posted on: August 20, 2018 by Maria Held
Due to high sun exposure on peppers the fruit may develop areas that go from green to yellow and sunken, then become dry and brown. In the case of cucumbers the green bleaches out to white and the tissue becomes soft. Because of extreme temperatures this is occurring more than usual this season. Sufficient leaf cover is the best prevention. Shading the affected plants especially on the west side with shade cloth is helpful.
» http://msue.anr.msu.edu/news/hot_and_sunny_days_promote_sunscald_in_peppers_and_other_vegetables
» http://ipm.illinois.edu/diseases/series900/rpd939/rpd939.html
Psyllid update 17 August 2018
Potato All Locations
Potato Psyllid
Posted on: August 17, 2018 by Lucy Standley
Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (9 fields), Payette (1 field), Twin Falls (3 fields), Jerome (1 field), Cassia (1 field), and Bannock (1 field).
This week, we collected 36 psyllids from sticky cards (across 12 light sites and 4 intense sites).
We had traps deployed in all 95 of the 95 fields (100%) monitored this year and found psyllids in 16 of the monitored fields (16.8%). However, we are still waiting to receive card data from 4 sites.
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. With only two Lso-positive psyllids found to date, percent incidence is currently considerably lower than in most previous years. Nevertheless, we urge growers and crop consultants to have an IPM program in place.
“Heat maps” of this week’s results will be included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho
» http://www.uidaho.edu/cals/potatoes/news
Ag Talk Tuesday! -- Special presentation on Market outlook and break-even prices, by Ben Eborn, UI
All Crops All Locations
Posted on: August 10, 2018 by Juliet Marshall
Greetings:
You are invited to join University of Idaho Extension personnel and fellow growers, fieldmen, agronomists, and industry reps to discuss current issues in crop production.
When: August 21, 7AM to 8:30AM
Where: Perkins, Pocatello (1600 Pocatello Creek Rd) - BANQUET ROOM
Topics include:
-- Special presentation on Market outlook and break-even prices, by Ben Eborn, UI Extension Ag Economist
-- Harvest update
-- UI Spore Trap Update
For convenience, selected breakfast options will be available for purchase (optional).
Questions can be directed to one of the Organizers:
Kasia Duellman, U of I Extension Seed Potato Specialist, kduellman@uidaho.edu
Pam Hutchinson, U of I Extension Weed Specialist, phutch@uidaho.edu
Juliet Marshall, U of I Extension Cereals Specialist, jmarshall@uidaho.edu
Please feel free to forward this invitation to your colleagues, and the attached PDF file is available for your convenience to print and display or distribute.
Sincerely,
Kasia
----------------------------------------------------------------------------
Kasia M. Duellman, PhD
Assistant Professor and Extension Seed Potato Specialist
University of Idaho - Idaho Falls REC
1776 Science Center Drive, Suite 205
Idaho Falls, Idaho 83402
Psyllid update 10 August 2018
Potato All Locations
Potato Psyllid
Posted on: August 10, 2018 by Lucy Standley
Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (10 fields), Payette (1 field), Twin Falls (1 field), Jerome (1 field), Cassia (3 fields), Minidoka (1 field), Power (1 field), and Oneida (1 field).
This week, we collected 36 psyllids from sticky cards (across 15 light sites and 4 intense sites).
We had traps deployed in all 95 of the 95 fields (100%) monitored this year and found psyllids in 19 of the monitored fields (20%). However, we are still waiting to receive card data from 3 sites.
This week we also collected one psyllid from vacuum sampling in one Canyon county field.
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.
Although psyllid numbers continue to be relatively low thus far this year, we are now starting to see a few more captures in eastern Idaho. With only two Lso-positive psyllids found to date, percent incidence is currently considerably lower than in most previous years.
Nevertheless, we urge growers and crop consultants to have an IPM program in place.
“Heat maps” of this week’s results will be included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho
» http://www.uidaho.edu/cals/potatoes/news
corn earworm counts 8/9/18
Corn Treasure Valley
corn earworm
Posted on: August 9, 2018 by Jerry Neufeld
The pdf below has the corn earworm adult moth counts from this morning. There does not appear to be many corn earworm moths in the area. However, scout your fields to be sure.
Raspberry Cane Damage
All Crops All Locations
Rose Stem Girdler
Posted on: August 8, 2018 by Maria Held
Rose Stem Girdler damage has been observed in raspberries. The canes wilt from the top or break at the girdling site. Cut the stem at ground level and destroy infested canes
» https://extension.usu.edu/productionhort/files-ou/RoseStemGirdler.pdf
» https://utahpests.usu.edu/ipm/agricultural/fruit/rose-stem-girdler
» http://oregonstate.edu/dept/nurspest/rose_stem_girdler.html
Coddling Moth (3rd Generation!)
All Crops All Locations
Posted on: August 8, 2018 by Dian Roberson
Based on Degree Day Models, we will have a third generation of coddling moths this year! Stay vigilant. Practice good sanitation by removing and disposing of young damaged fruit.
» https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth
Ag Talk Tuesday - Blackfoot, ID Aug 7
All Crops Eastern Idaho
Posted on: August 6, 2018 by Juliet Marshall
Greetings:
Please join University of Idaho Extension personnel and fellow growers, fieldmen, agronomists, and industry reps to discuss current issues in crop production. This event is held periodically on selected Tuesdays at various locations across eastern and southeastern Idaho throughout the growing season, over breakfast or lunch.
The next event will be August 7, 7AM to 8:30AM, at Idaho AgCredit (188 West Judicial, Blackfoot; Tel: 208-785-1510; in the Conference Room). Topics will include (but are not limited to) vine kill options, harvest update, and an update on the UofI Spore Trap Network. Breakfast items will be provided and are sponsored by Idaho AgCredit. A flyer is attached for your convenience. Please feel free to distribute it to whomever you think may be interested.
Please RSVP by calling 208-529-8376 or emailing one of the organizers:
Kasia Duellman, UofI Extension Seed Potato Specialist, kduellman@uidaho.edu
Pam Hutchinson, UofI Extension Weed Specialist, phutch@uidaho.edu
Juliet Marshall, UofI Extension Cereals Specialist, jmarshall@uidaho.edu
Psyllid update 3 August 2018
Potato All Locations
potato psyllids
Posted on: August 3, 2018 by Erik Wenninger
Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (12 fields), Cassia (1 field), Jerome (1 field), Payette (1 field), and Twin Falls (2 fields).
This week, we collected 32 psyllids from sticky cards (across 11 light sites and 6 intense sites).
We had traps deployed in all 96 of the 96 fields (100%) monitored this year and found psyllids in 17 of the monitored fields (17.7%).
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.
Psyllid numbers continue to be relatively low thus far this year. With only two Lso-positive psyllids found to date, percent incidence is currently lower than what has typically been found during most previous years.
Nevertheless, we urge growers and crop consultants to have an IPM program in place.
Included on the PNW Pest Alert version of this update (http://www.pnwpestalert.net/) is a “heat map” of this week’s results (only for the western half of the state; we captured only one psyllid in the eastern half this week). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
corn earworm counts 7/30/28
Corn Treasure Valley
corn earworm
Posted on: July 30, 2018 by Jerry Neufeld
Click on the pdf below for the latest corn earworm moth counts. CEW pressure still seems to be fairly light.
Psyllid update July 27, 2018
Potato All Locations
Potato Psyllid
Posted on: July 27, 2018 by Lucy Standley
Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (11 fields), Cassia (1 field), Minidoka (1 field), Payette (1 field), and Twin Falls (1 field).
This week, we collected 30 psyllids from sticky cards (across 13 light sites and 2 intense sites).
We had traps deployed in 96 of the estimated 96 fields (100%) monitored this year and found psyllids in 15 of the monitored fields (19.8%). However, we are still waiting to receive cards from 13 sites.
Testing of last week’s psyllids for Lso has been delayed due to the Potato Association of America meeting this week.
Psyllid numbers remain relatively low thus far this year. With two Lso-positive psyllids found to date, percent incidence is similar to what has typically been found during most previous years.
Nevertheless, we urge growers and crop consultants to have an IPM program in place.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
corn earworm counts 7/25/28
Corn Treasure Valley
corn earworm
Posted on: July 25, 2018 by Jerry Neufeld
Below are the corn earworm counts for 7/25/18 for the Treasure Valley. There does not appear to by very many corn earworm moths around at the moment.
Location 7/25/18
South of Caldwell 0
West of Kuna 2
North of Melba 0
SW of Nampa 5
South of Homedale 1
West of Greenleaf 1
NW of Wilder 0
East of Notus 0
Psyllid update July 20, 2018
Potato All Locations
Potato Psyllid
Posted on: July 20, 2018 by Lucy Standley
Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (10 fields), Cassia (3 fields), Elmore (1 field), Minidoka (2 fields), Payette (1 field), and Twin Falls (2 fields).
This week, we collected 29 psyllids from sticky cards (20 light sites and 9 intense sites).
We had traps deployed in 93 of the estimated 96 fields (96%) that will be monitored this year and found psyllids in 19 of the monitored fields (20.4%).
All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.
Psyllid numbers remain relatively low thus far this year. With two Lso-positive psyllids found to date, percent incidence is similar to what has typically been found during most previous years.
Nevertheless, we urge growers and crop consultants to have an IPM program in place.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
Ag Talk Tuesday!
All Crops Eastern Idaho
ATT
Posted on: July 16, 2018 by Juliet Marshall
Please join U of I Extension Specialists at Ag Talk Tuesday July 17 in Idaho Falls at Papa Tom's from 11:30AM to 1:00PM, for a no-host lunch to discuss current crop problems.
Directions to Papa Tom's: https://www.google.com/maps/dir/''/papa+tom's+idaho+falls/@43.4807967,-112.0713223,12z/data=!4m8!4m7!1m0!1m5!1m1!1s0x53545edb01d42491:0xfd4d454007e025a9!2m2!1d-112.0012825!2d43.4808181
In addition to current crop problems, Dr. Pamela Hutchinson will present information on post-emergence weed control, and I'll provide an update on the UofI Spore Trap Network.
Please RSVP to one of the co-hosts if you plan to attend :
Kasia Duellman - kduellman@uidaho.edu
Pamela Hutchinson - phutch@uidaho.edu
Juliet Marshall - jmarshall@uidaho.edu
Or you can call 208-529-8376.
Note: There will be no ATT on 7/24 or 7/31. Additional ATT meetings will be scheduled for August (8/7 and 8/21 currently) and September.
We hope you can join us - your insight and observations add value to these meetings, to everyone's benefit.
Thrips Update 7/13/18
Onion Treasure Valley
thrips
Posted on: July 16, 2018 by Jerry Neufeld
Stuart Reitz, from OSU Malheur County Extension, is monitoring Treasure Valley onion fields for thrips this summer. Click on the pdf below for an update on this project as of 7/13/18.
Second Lso-positive potato psyllid this year
Potato All Locations
Potato Psyllid
Posted on: July 13, 2018 by Lucy Standley
Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (8 fields), Cassia (3 fields), Owyhee (1 field), Jerome (2 fields), and Twin Falls (3 fields).
This week, we collected 31 psyllids from sticky cards (13 light sites and 4 intense sites).
We had traps deployed in 92 of the estimated 96 fields (96%) that will be monitored this year and found psyllids in 17 of the monitored fields (18.5%).
One psyllid collected last week in Canyon County tested positive for Lso (liberibacter), the bacterium that causes zebra chip.
Psyllid numbers remain relatively low thus far this year. With two Lso-positive psyllids found to date, percent incidence is similar to what has typically been found during most previous years.
Nevertheless, we urge growers and crop consultants to have an IPM program in place.
More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
Fusarium Head Blight in winter wheat
Small Grains All Locations
Fusarium head blight
Posted on: July 11, 2018 by Juliet Marshall
Fusarium head blight (FHB or head scab) is being found in winter wheat and spring wheat.
Fields throughout southern and southeast Idaho are being affected by FHB, everywhere from Glenn’s Ferry through Firth. Some winter wheat fields have white heads caused by take all as well as partial to whole heads bleached by FHB. While it is unlikely that there are any fields still in the vulnerable stages (flowering), at risk fields should be protected with appropriate fungicide application. Fields should still be scouted and infected grain fields identified prior to harvest. DON (deoxynivalenol or vomitoxin) contaminated, infected seed and tombstone kernels can be reduced by increasing the fan speeds on the combine. This can significantly reduce dockage and rejection at the elevator.
corn earworm - 2018
Corn Treasure Valley
corn earworm
Posted on: July 11, 2018 by Jerry Neufeld
I am once again collaborating with Crookham Seed Co. on a project to trap corn earworm moths. Traps will be set out in corn fields at various locations near Dry Lake, Kuna, Melba, Middleton, Wilder, Homedale, and Caldwell. I will check the traps every few days and post the moth counts to this website.
The online Phenology and Degree Day Model (GDD) from Oregon State University is being used to estimate when the summer generation of corn earworm moths will emerge. This is the generation of moths that lay eggs in corn that is silking at the time when they emerge. The link to the GDD calculator for Corn Earworm is below.
The GDD model uses January 1 as a biofix, 55 and 92 as the temperature parameters and predicts the summer moths will emerge after 1300 GDD. These moths will then begin laying eggs in fresh corn silk. This model also estimates the eggs will hatch and larvae will begin feeding on corn ears 73 GDD later. According to this model, we will reach 1300 GDD in the Caldwell area about July 22, and will reach 1300 GDD in the Parma area about July 20. Egg laying in most, if not all, Treasure Valley locations will take place in this time frame. Larval feeding will begin 3 to 4 days later.
Traps will go out next week. The first moth counts will be posted a few days after the traps are set out.
The links below will take you to the websites where you can use the growing degree day model and also view various treatment methods based on the type of corn that you are growing.
» https://pnwhandbooks.org/insect/crop-pests?combine=earworm
