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corn earworm - 2022
Corn Treasure Valley - Idaho
corn earworm
Posted on: August 5, 2022 by Jerry Neufeld
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. Summer moths will emerge after 1300 GDD have accumulated. 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 egg hatch is beginning about now. Egg laying in most, if not all, Treasure Valley locations will take place in this approximate time frame. Larval feeding will begin 3 to 4 days after egg hatch.
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/vegetable-seed/corn/corn-seed-corn-earworm-sweet-corn-only
» https://pnwhandbooks.org/insect/vegetable/vegetable-pests/hosts-pests/corn-sweet-corn-earworm
» https://pnwhandbooks.org/insect/agronomic/field-silage-corn/field-silage-corn-corn-earworm
Corn Earworm Counts - 8/4/21
Corn Treasure Valley
corn earworm
Posted on: August 4, 2021 by Jerry Neufeld
Below are the corn earworm moth counts from this morning, August 4. The counts are increasing in certain areas, as you can see below. If you have corn with fresh silk you may want to increase your scouting in areas where the counts are increasing.
Location Date
23-Jul 28-Jul 4-Aug
South of Nampa 2 2 9
Melba 1 0 0
Homedale 4 12 21
Wilder 3 3 29
Roswell 0 4 22
Middleton 2 0 3
Total 12 21 84
Corn Earworm Counts - 7/28/21
Corn Treasure Valley
corn earworm
Posted on: July 29, 2021 by Jerry Neufeld
Below are the corn earworm
moth counts from this morning, July 28. At
this time counts are still low, except they are rising a little bit in the
Homedale area. I will check the traps
again in a few days to see if the numbers are increasing.
Location | Date | |
23-Jul | 28-Jul | |
South | 2 | 2 |
Melba | 1 | 0 |
Homedale | 4 | 12 |
Wilder | 3 | 3 |
Roswell | 0 | 4 |
Middleton | 2 | 0 |
Total | 12 | 21 |
Corn Earworm Counts - 7/23/21
Corn Treasure Valley
corn earworm
Posted on: July 23, 2021 by Jerry Neufeld
Below are the corn earworm moth counts from this morning, July 23. At this time there doesn’t appear to be a great deal of corn earworm moths around the valley. I will check the traps again in a few days to see if the numbers are increasing.
Location July 23
South on Nampa 2
Melba 1
Homedale 4
Wilder 3
Roswell 0
Middleton 2
Total 12
Corn Earworm - 2021
Corn Treasure Valley
corn earworm
Posted on: July 12, 2021 by Jerry Neufeld
I am once again
collaborating with Charter Seed Co. and Crookham Co. on a project to trap corn
earworm moths. Traps will be set out in
corn fields at various locations near 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. Summer
moths will emerge after 1300 GDD have accumulated. 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 12, and will reach 1300 GDD in
the Parma area about July 15. This is 10
to 14 days earlier than last year. Egg
laying in most, if not all, Treasure Valley locations will take place in this approximate
time frame. Larval feeding will begin 3
to 4 days after egg hatch.
Traps will go out soon. 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://uspest.org/cgi-bin/ddmodel.us
» https://pnwhandbooks.org/insect/vegetable-seed/corn/corn-seed-corn-earworm-sweet-corn-only
» https://pnwhandbooks.org/insect/vegetable/vegetable-pests/hosts-pests/corn-sweet-corn-earworm
» https://pnwhandbooks.org/insect/agronomic/field-silage-corn/field-silage-corn-corn-earworm
Corn Earworm Counts - 8/16/20
Corn Treasure Valley
corn earworm
Posted on: August 16, 2020 by Jerry Neufeld
Click on the pdf below for the corn earworm moth counts from this morning, August 16. There are still moths around this week, but there is less fresh silk for them to lay eggs in. The traps have been removed from the fields, there will be no more moth counts this growing season.
Corn Earworm Counts - 8/12/20
Corn Treasure Valley
corn earworm
Posted on: August 12, 2020 by Jerry Neufeld
Click on the pdf below for the corn earworm moth counts from this morning, August 12. There are quite a few more moths this week. There are corn earworm moths around the valley, scouting on a more localized basis is still probably a good thing to do.
corn earworm counts - 8/5/2020
Corn Treasure Valley
corn earworm
Posted on: August 5, 2020 by Jerry Neufeld
Click on the pdf below for the corn earworm moth counts from this morning, August 5. There are more moths this week, but the counts are still not real high. There are corn earworm moths around the valley, scouting on a more localized basis is still probably a good thing to do.
Corn Earworm Counts - 7/29/20
Corn Treasure Valley
corn earworm
Posted on: July 29, 2020 by Jerry Neufeld
Below are the corn earworm moth counts from this morning, July 29. At this time there doesn’t appear to be a great deal of corn earworm moths around the valley. I will check the traps again in a few days to see if the numbers increase.
Location, Date, 29-Jul
West of Caldwell 7
South of Nampa 4
Melba 8
SouthWest of Homedale 0
West of Wilder 0
West of Notus 8
Middleton 1
Corn Earworm - 2020
Corn Treasure Valley
corn earworm
Posted on: July 20, 2020 by Jerry Neufeld
I am once again collaborating with Charter Seed Co. and Crookham Co. on a project to trap corn earworm moths. Traps will be set out in corn fields at various locations near 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. Summer moths will emerge after 1300 GDD have accumulated. 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 29, and will reach 1300 GDD in the Parma area about July 30. Egg laying in most, if not all, Treasure Valley locations will take place in this approximate time frame. Larval feeding will begin 3 to 4 days later.
Traps will go out in a couple of days. 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/vegetable-seed/corn/corn-seed-corn-earworm-sweet-corn-only
» https://pnwhandbooks.org/insect/vegetable/vegetable-pests/hosts-pests/corn-sweet-corn-earworm
» https://pnwhandbooks.org/insect/agronomic/field-silage-corn/field-silage-corn-corn-earworm
Corn Earworm Counts - 8/14/19
Corn Treasure Valley
corn earworm
Posted on: August 14, 2019 by Jerry Neufeld
Click on the pdf below to see the corn earworm counts taken this morning. It appears there are still CEW moths in the valley; however, the threat of damage should be getting smaller since the CEW moths lay eggs in fresh silk, and there is less and less fresh silk around each day.
Corn Earworm Counts - 8/6/19
Corn Treasure Valley
corn earworm
Posted on: August 6, 2019 by Jerry Neufeld
Below are the corn earworm moth counts from this morning, August 6. There may be a few more moths this week, but the counts are still not real high. I am also including moth counts taken from the Grandview area. There are corn earworm moths around the valley, scouting on a more localized basis is still probably a good thing to do. I do not like the way the table displays in this box, so click on the pdf below to see the moth counts.
Corn Earworm Counts - 7/31/19
Corn Treasure Valley
corn earworm
Posted on: July 31, 2019 by Jerry Neufeld
Below are the corn earworm moth counts from this morning. The greatest number of moths were found south of Lake Lowell and near Melba. Still, the numbers are fairly low. I am not aware of any thresholds in Idaho for this pest. According to a Purdue Extension publication entitled CORN INSECT CONTROL RECOMMENDATIONS – 2016, “control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheromone trap just before or during silking.” You may want to scout cornfields for this pest, especially south of Lake Lowell and near Melba.
Location Date 7/31/19
South of Caldwell 5
South of Lake Lowell 18
South of Nampa 3
Melba 12
South of Melba 13
SouthWest of Homedale 7
West of Wilder 1
Between Parma & Wilder 3
West of Caldwell 7
Corn Earworm near Hammett, ID
Corn Treasure Valley
corn earworm
Posted on: July 25, 2019 by Jerry Neufeld
Sweet corn in the Hammett Idaho area has been found with earworm larvae. It is time to start scouting for this pest is you haven't already done so.
Corn Earworm - 2019
Corn Treasure Valley
corn earworm
Posted on: July 23, 2019 by Jerry Neufeld
I am once again collaborating with Charter 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. Summer moths will emerge after 1300 GDD have accumulated. 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 28, and will reach 1300 GDD in the Parma area about July 30. This is 6-10 days later than 2018. 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 in a couple of days. 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/vegetable-seed/corn/corn-seed-corn-earworm-sweet-corn-only
» https://pnwhandbooks.org/insect/vegetable/vegetable-pests/hosts-pests/corn-sweet-corn-earworm
» https://pnwhandbooks.org/insect/agronomic/field-silage-corn/field-silage-corn-corn-earworm
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.
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.
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
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
corn earworms counts for August 16
Corn Treasure Valley
corn earworm
Posted on: August 16, 2017 by Jerry Neufeld
Below are the corn earworm counts by location taken this morning, August 16. The counts are the highest they have been this year, but remember, University of Idaho CIS 366 entitled "Timing Corn Earworm Control" states that corn earworm moths lay eggs in freshly silking corn.
Weekly Corn Earwom Counts, 2017
Location 7/25, 8/1, 16-Aug
Melba 51, 3, 1
South Nampa 3, 17, 26
South Caldwell 12, 15, 51
Huston 15, 6, 7
Homedale 10, 22, 38
Wilder 41, 23, 29
Middleton 5, 12, 27
totals 137, 98, 179
corn earworms counts for August 1
Corn Treasure Valley
corn earworm
Posted on: August 1, 2017 by Jerry Neufeld
Corn earworm traps with pheromone lures were set out at 7 locations two weeks ago. Below are the moth counts taken from these traps as of August 1. Moth counts are higher this year than they have been for several years.
Location 7/25, 8/1
Melba 51, 3
South Nampa 3, 17
South Caldwell 12, 15
Huston 15, 6
Homedale 10, 22
Wilder 41, 23
Middleton 5, 12
Totals 137, 98
corn earworm counts from July 25
Corn Treasure Valley
corn earworm
Posted on: July 25, 2017 by Jerry Neufeld
Corn earworm traps with pheromone lures were set out at 7 locations last week. Below are the moth counts taken from these traps on July 25. I have not seen moth counts this high for several years. I have also talked with industry people that say they are seeing a lot of moths this year.
Location 7/25/17/
Melba 51
South Nampa 3
South Caldwell 12
Huston 15
Homedale 10
Wilder 41
Middleton 5
Total 137
Corn Earworm might be a bit early
Corn Treasure Valley
corn earworm
Posted on: July 16, 2017 by Jerry Neufeld
After I posted the forecasting alert about corn earworm a few days ago, I received an email stating that the summer generation of corn earworm moths has already made an appearance in the MIddleton area. The grower stated they have never had corn earworm before, but they have them this year. It could be that the models are off by a few days, regardless, with this information it would be wise to start scouting for corn earworm now.
Corn Earworm 2017
Corn Treasure Valley
corn earworm
Posted on: July 12, 2017 by Jerry Neufeld
I am once again collaborating with Charter Seed Co. and 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 Phenolgy 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 31. 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/vegetable-seed/corn/corn-seed-corn-earworm-sweet-corn-only
» https://pnwhandbooks.org/insect/vegetable/vegetable-pests/hosts-pests/corn-sweet-corn-earworm
» https://pnwhandbooks.org/insect/agronomic/field-silage-corn/field-silage-corn-corn-earworm
Corn Earworm moth counts for August 10
Corn Treasure Valley
corn earworm
Posted on: August 10, 2016 by Jerry Neufeld
Below is the final corn earworm count for this year. There didn’t seem to be a lot of corn earworm this year. That is what I have found for the last couple of years. I would appreciate hearing from you if you had a different experience.
Dry Lake 4
Kuna 1
Melba 10
Homedale 14
Wilder 8
Parma 2
Caldwell 0
total 39
Corn Earworm counts for August 4
Corn Treasure Valley
corn earworm
Posted on: August 4, 2016 by Jerry Neufeld
Here are the corn earworm moth counts from this morning. The greatest number of moths were trapped in the Homedale area. Still, the numbers are fairly low. According to a Purdue Extension publication entitled CORN INSECT CONTROL RECOMMENDATIONS – 2016, “control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheromone trap just before or during silking.” You may want to scout cornfields, especially n the Homedale area, for this pest.
Dry Lake 5
Kuna 6
Melba 7
Homedale 27
Wilder 5
Parma 3
Caldwell 1
total 54
Corn Earworm moth counts for July 27
Corn Treasure Valley
corn earworm
Posted on: July 27, 2016 by Jerry Neufeld
I am still not seeing much in the way of corn earworm moths. Below is the count that was taken this morning.
Location 7/27
Dry Lake 1
Kuna 0
Melba 4
Homedale 2
Wilder 2
Parma 2
Caldwell 0
Total 11
Corn Earworm counts for July 22
Corn Treasure Valley
corn earworm
Posted on: July 22, 2016 by Jerry Neufeld
A few corn earworm moths (adults) are starting to show up in the traps I set out earlier this week. Although, the numbers are low. Below are the moth counts from this morning, July 22.
Dry Lake 0
Kuna 1
Melba 4
Homedale 4
Wilder 1
Parma 0
Caldwell 1
11
I am not aware of treatment thresholds for this pest in Idaho, however, the following excerpt was taken from an Extension Publication from Purdue University.
Management Guidelines
Corn Insect Control Recommendations: E-series 219-W
For seed production fields, if 10 or more moths are captured in a pheromone trap for several consecutive nights, economic damage is possible. However, only fields silking and/or pollinating during this time are candidates for treatment.
You may want to step up your field scouting and work closely with your crop consultant to determine if a treatment is necessary.
Corn Earworm 2016
Corn Treasure Valley
corn earworm
Posted on: July 11, 2016 by Jerry Neufeld
I am once again collaborating with Charter Seed Co. and 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, Wilder, Homedale, and Caldwell. I will check the traps every few days and post the moth counts to this website.
There are a couple of models that can be used to predict the emergence of the summer generation of corn earworm moths. This is the generation of moths that lay eggs in corn that is silking at the time of their emergence.
One model uses January 1 as a biofix, 55 and 92 as the temperature parameters and predicts the summer moths will appear after 1300 growing degree days (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 Parma area on 7/23 and 1300 GDD in the Caldwell area on 7/23. Egg laying in most, if not all, Treasure Valley locations will take place about this same time. This is about 9 days later than 2015.
The second model simply uses 8/1 as the default date that the summer moths will emerge and begin laying eggs in fresh corn silk. I do not think this model will be of value this year.
Traps will go out early 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 view the growing degree day model and also view various treatment methods based on the type of corn that you are growing.
» http://insect.pnwhandbooks.org/vegetable-seed/corn/corn-seed-corn-earworm-sweet-corn-only
» http://insect.pnwhandbooks.org/vegetable/vegetable-pests/hosts-and-pests/corn-sweet-corn-earworm
» http://insect.pnwhandbooks.org/agronomic/field-and-silage-corn/field-and-silage-corn-corn-earworm
corn earworm
Corn Treasure Valley
corn earworm
Posted on: August 6, 2015 by Jerry Neufeld
Below are the corn earworm moth counts from this morning, August 6. Corn earworm moths lay eggs in corn with fresh silk. Since silking is done for the year, this will be my last corn earworm count for the growing season.
Melba Area 0
South of Nampa 0
Middleton Area 0
Parma Area 8
Wilder Area 44
Homedale Area 4
Pride Lane 0
Corn Earworm
Corn Treasure Valley
corn earworm
Posted on: July 30, 2015 by Jerry Neufeld
It appears corn earworm moths (adults) are starting to show up in slightly larger numbers, although, my trapping numbers are still fairly low. Below are the moth counts from this morning, July 30.
Melba Area 0
South of Nampa 0
Middleton Area 3
Parma Area 4
Wilder Area 18
Homedale Area 12
Pride Lane 0
I am not aware of Idaho treatment thresholds for this pest, however, the following excerpt was taken from an Extension Publication from Purdue University.
Management Guidelines
Corn Insect Control Recommendations: E-series 219-W (PDF)
For seed production fields, if 10 or more moths are captured in a pheromone trap for several consecutive nights, economic damage is possible. However, only fields silking and/or pollinating during this time are candidates for treatment.
You may want to step up your field scouting and work closely with your crop consultant to determine if a treatment is necessary.
» http://insect.pnwhandbooks.org/vegetable-seed/corn/corn-seed-corn-earworm-sweet-corn-only
» http://insect.pnwhandbooks.org/vegetable/vegetable-pests/hosts-and-pests/corn-sweet-corn-earworm
Corn Earworm
Corn Treasure Valley
corn earworm
Posted on: July 23, 2015 by Jerry Neufeld
I checked the corn earworm traps today. I found a few, but not too many. Below are the counts.
Location 7/16 7/23
Melba Area 0 0
South of Nampa 0 0
Middleton Area 0 0
Parma Area 0 0
Wilder Area 0 16
Homedale area 0 2
Pride Lane 0 0
corn earworm
Corn Treasure Valley
earworm
Posted on: August 12, 2014 by Jerry Neufeld
Here is my count of corn earworm moths as of this morning.
Location 7/23 7/29 4-Aug 12-Aug
caldwell area 0 0 0 0
melba area 0 0 0 0
north of lake lowell 0 0 0 7
west of greenleaf 0 0 0 8
east of wilder 0 0 0 3
west of wilder 0 0 0 0
north of homedale 0 0 0 1
0 0 0 19
corn earworm
Corn Treasure Valley
earworm
Posted on: August 4, 2014 by Jerry Neufeld
I still have not found any adult corn earworm moths in the traps I set out. They are being checked once a week.
Weekly Corn Earwom Counts, 2014
Date
Location 7/23 7/29 4-Aug
caldwell area 0 0 0
melba area 0 0 0
north of lake lowell 0 0 0
west of greenleaf 0 0 0
east of wilder 0 0 0
west of wilder 0 0 0
north of homedale 0 0 0
Mites in field corn
Corn Treasure Valley
Mites
Posted on: July 31, 2014 by Bill Buhrig
Local crop consultants are seeing an increased number of mites in cornfields in the Treasure Valley. Mite populations can flare quickly so it is important to scout fields. Work with your crop consultant to help determine threshold numbers and develop a treatment plan if necessary. Please refer to the link below for information on available treatment products from the PNW Insect Management Handbook.
» http://insect.pnwhandbooks.org/agronomic/field-and-silage-corn/field-and-silage-corn-mite
corn earworm
Corn Treasure Valley
earworm
Posted on: July 29, 2014 by Jerry Neufeld
I am collaborating with Charter Seed Co. and Crookham Seed Co. on a project to trap corn earworm moths. We set out 7 traps in corn fields at various locations from near Melba to near Wilder. I am checking the traps every few days and posting the moth counts to this website. Below are the moth counts from this week. Once again, I did not find any adult corn earworm moths in the traps.
There are a couple of models that can be used to predict the emergence of the summer generation of corn earworm moths. This is the generation that lays eggs in corn that is silking at the time of their emergence.
One model uses January 1 as a biofix, 55 and 95 as the temperature parameters and predicts the summer moths will appear after 1300 growing degree days (GDD) and 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 reached 1300 GDD in the Parma area on 7/21 and 1300 GDD in the Caldwell area on 7/25, yet I have not found any adult moths. We will reach 1300 GDD in the Nampa area today.
The second model simply uses 8/1 as the default date; the date the summer moths will emerge and begin laying eggs in fresh corn silk.
Since I have not found any adult moths yet there could be several things going on. 1) The traps and lures are not working. I used these traps with CEW pheromones lures a few years ago and they worked just fine. 2) There aren’t any corn earworm moths this year. It could happen, but this is rather unlikely. 3) The model using January 1 as a biofix isn’t quite right for our area. My suspicion is that the model using January 1 as a biofix is not quite accurate for our area and we will soon see the summer generation of moths appear. I have talked to some industry people and like me, they have not yet seen the summer generation of CEW moths. Stay tuned, I will check the traps next week and let you know what I find out.
Weekly Corn Earwom Counts, 2014
Date
Location 7/23 7/29
caldwell area 0 0
melba area 0 0
north of lake lowell 0 0
west of greenleaf 0 0
east of wilder 0 0
west of wilder 0 0
north of homedale 0 0
corn earworm
Corn Treasure Valley
earworm
Posted on: July 23, 2014 by Jerry Neufeld
I am collaborating with Charter Seed Co. and Crookham Seed Co. on a project to trap corn earworm moths. We set out 7 traps in corn fields at various locations from near Melba to near Wilder. I am checking the traps every few days and posting the moth counts to this website.
Below are the moth counts from this week.
Location 7/23
caldwell area 0
melba area 0
north of lake lowell 0
west of greenleaf 0
east of wilder 0
west of wilder 0
north of homedale 0
corn earworm
Corn Treasure Valley
corn earworm
Posted on: July 23, 2013 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer corn earworm moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University GDD model for Corn Earworm (http://uspest.org/cgi-bin/ddmodel.us ), we are currently at 1301 GDD in the Caldwell area, 1264 GDD in the Nampa area, and 1140 GDD in the Parma area. We will hit approximately 1373 GDD in the Caldwell and Nampa areas on 7/26, 1373 GDD in the Parma area on approximately 7/31. Those fields with fresh silk at 1373 GDD are most vulnerable to attack from corn earworm larvae.
corn earworm
Corn Treasure Valley
corn earworm
Posted on: July 12, 2013 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer corn earworm moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later. Click on the pdf below to view CIS 366.
According to the Oregon State University GDD model for Corn Earworm (http://uspest.org/cgi-bin/ddmodel.us ), we are currently at 1057 GDD in the Caldwell area, 1008 GDD in the Nampa area, and 1134 GDD in the Parma area. We will hit 1300 GDD in the Caldwell area on approximately 7/21, 1300 GDD in the Nampa area on approximately 7/24, and 1300 GDD in the Parma area on approximately 7/18. At each location, we will hit 1373 GDD about 3 to 4 days after reaching 1300 GDD. Those fields with fresh silk at 1373 GDD are most vulnerable to attack from corn earworm larvae. The links below contain management information from the Pacific Northwest Insect Management Handbook.
» http://pnwhandbooks.org/insect/vegetable-seed/corn/corn-seed-corn-earworm-sweet-corn-only
» http://pnwhandbooks.org/insect/vegetable/vegetable-pests/hosts-and-pests/corn-sweet-corn-earworm
corn earworm
Corn Treasure Valley - Idaho
corn earworm
Posted on: July 20, 2012 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer corn earworm moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later. Click on the pdf below to view CIS 366.
According to the Oregon State University GDD model for Corn Earworm (http://uspest.org/cgi-bin/ddmodel.pl?clm), we are currently at 1164 GDD in the Caldwell area, 1134 GDD in the Nampa area, and 1130 GDD in the Parma area. We will hit 1300 GDD in the Caldwell area on approximately 7/23, 1300 GDD in the Nampa area on approximately 7/26, and 1300 GDD in the Parma area on approximately 7/26. At each location, we will hit 1373 GDD about 3 to 4 days after reaching 1300 GDD. Those fields with fresh silk at 1373 GDD are most vulnerable to attack from corn earworm larvae.
corn earworm in sweet corn
Corn Treasure Valley - Idaho
corn earworm
Posted on: August 8, 2011 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer corn earworm moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University GDD model for Corn Earworm (http://uspest.org/cgi-bin/ddmodel.pl?clm), we are currently at 1187 GDD in the Caldwell area, 1098 GDD in the Nampa area, and 1160 GDD in the Parma area. We will hit 1300 GDD in the Caldwell area on approximately 8/14, 1300 GDD in the Nampa area on approximately 8/19, and 1300 GDD in the Parma area on approximately 8/16. At each location, we will hit 1373 GDD about 3 to 4 days after reaching 1300 GDD. Those fields with fresh silk at 1373 GDD are most vulnerable to attack from corn earworm larvae.
corn earworm in sweet corn
Corn Treasure Valley - Idaho
corn earworm
Posted on: August 2, 2011 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer corn earworm moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University GDD model for Corn Earworm (http://uspest.org/cgi-bin/ddmodel.pl?clm), we are currently at 1058 GDD in the Caldwell area, 988 GDD in the Nampa area, and 1034 GDD in the Parma area. We will hit 1300 GDD in the Caldwell area on approximately 8/12, 1300 GDD in the Nampa area on approximately 8/17, and 1300 GDD in the Parma area on approximately 8/14. We are accumulating about 20 to 22 GDD per day. At each location, we will hit 1373 GDD about 3 to 4 days after reaching 1300 GDD. Those fields with fresh silk at 1373 GDD are most vulnerable to attack from corn earworm larvae.
The following information was taken from CIS 366 regarding corn earworm.
Corn can be “scouted” for corn earworm eggs to predict possible infestation levels. Examine 10 silk masses (about 2-day old) on each edge of a field but only in those fields which are beginning to silk or are silking. Examining a field in late silk for the first time is worthless; most of the eggs, if any were present, are already hatched, and the damage cannot be prevented.
When the egg counts average 1 egg per 2 silk masses, about 100% ear infestation will occur in the field and other fields of like maturity in the vicinity. With 1 egg per 2 silk masses, about 1 inch of each ear tip will be damaged; 1 egg per silk mass will result in about 2 inches of the ear tip damage, etc. When the days and nights are warmer than usual, the damage may double because the earworm will develop faster than the corn.
Fields should be scouted about every 2 to 4 days, depending on temperatures. Once economic egg levels are reached, determined on the basis of damage expected, further scouting is unnecessary. All fields which silk after that time in that vicinity will be subject to damage.
No chemical control will control worms in the ears, so sprays must be timed to control the larvae on the silk before the worms enter the ears. Make the first application when the plants are 50 percent silk, and repeat in 5 to 7 days or as necessary.
For control information from the 2011 Pacific Northwest Insect Management Handbook click on the link below. In the drop down boxes click on “vegetables” and then “sweet corn.” To read CIS 366 in its entirety click on the pdf below.
» http://uspest.org/pnw/insects
corn earworm
Corn Treasure Valley - Idaho
corn earworm
Posted on: August 20, 2010 by Jerry Neufeld
Dr. Jim Barbour from the UI Parma R and E Center, Terry Clinton from Crookham Company and I are once again collaborating on a project to trap corn earworm moths across the Treasure Valley. We set out 14 traps at various locations from near Melba to near Weiser. I check the traps once a week and post the moth counts to this website. Click on the pdf below for this week’s moth count. Purdue University recommends the treatment threshold to be 10 moths per trap per night.
corn earworm
Corn Treasure Valley - Idaho
corn earworm
Posted on: August 11, 2010 by Jerry Neufeld
The pdf below contains the corn earworm counts taken Aug 10 and 11, 2010 from across the Treasure Valley. Purdue University recommends the treatment threshold to be 10 moths per trap per night.
corn earworm
Corn Treasure Valley - Idaho
Posted on: August 21, 2009 by Jerry Neufeld
Dr. Jim Barbour from the UI Parma R and E Center, Terry Clinton from Crookham Company and I are collaborating on a project to trap corn earworm moths across the Treasure Valley. We set out 12 traps at various locations from near Melba to near Weiser. I am checking the traps every few days and posting the moth counts to this website. Below are the moth counts from this week . Purdue University recommends the treatment threshold to be 10 moths per trap per night. This is really the last set of data posted to the pest alert website for this project.
Date: 8/10/09 to 8/20/09
Location # of Moths caught
South ofWeiser 1--- 13
South ofWeiser 2--- 5
NW of Middleton--- 11
North of Wilder--- 114
South of Homedale 1--- 169
West of Caldwell--- 3
East of Homedale 2--- 105
NE of Marsing--- 96
North of Melba--- 3
East of Kuna 2--- 22
East of Kuna 3--- 5
Total moths caught---- 546
corn earworm
Corn Treasure Valley - Idaho
Posted on: August 11, 2009 by Jerry Neufeld
Dr. Jim Barbour from the UI Parma R and E Center, Terry Clinton from Crookham Company and I are collaborating on a project to trap corn earworm moths across the Treasure Valley. We set out 12 traps at various locations from near Melba to near Weiser. I am checking the traps every few days and posting the moth counts to this website. Below are the moth counts from this week . Purdue University recommends the treatment threshold to be 10 moths per trap per night. As the growing degree day model from Oregon State University predicted, the summer moths appeared in late July to early August and are now attempting to lay eggs in fresh corn silk. This will be the last set of data posted to the pest alert website for this project.
Date: 8/3/09 to 8/10/09
Location # of Moths caught
South ofWeiser 1--- 8
South ofWeiser 2--- 6
NW of Middleton--- 8
North of Wilder--- 112
South of Homedale 1--- 121
West of Caldwell--- 13
East of Homedale 2--- 148
NE of Marsing--- 26
North of Melba--- 4
East of Kuna 2--- 12
East of Kuna 3--- 5
Total moths caught--- 463
corn earworm
Corn Treasure Valley - Idaho
Posted on: August 4, 2009 by Jerry Neufeld
Dr. Jim Barbour from the UI Parma R and E Center, Terry Clinton from Crookham Company and I are collaborating on a project to trap corn earworm moths across the Treasure Valley. We set out 12 traps at various locations from near Melba to near Weiser. I am checking the traps every few days and posting the moth counts to this website. Below are the moth counts from this week . Purdue University recommends the treatment threshold to be 10 moths per trap per night. As the growing degree day model from Oregon State University predicted, the summer moths appeared in late July to early August and are now attempting to lay eggs in fresh corn silk.
Date: 7/27/09 to 8/4/09
South ofWeiser 1 ---2
South ofWeiser 2 ---3
NW of Middleton ---5
North of Wilder ---34
South of Homedale 1 ---22
West of Caldwell ---1
East of Homedale 2 ---30
NE of Marsing ---2
North of Melba ---0
East of Kuna 2 ---0
East of Kuna 3 ---0
Total moths caught ---99
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 28, 2009 by Jerry Neufeld
Dr. Jim Barbour from the UI Parma R and E Center, Terry Clinton from Crookham Company and I are collaborating on a project to trap corn earworm moths across the Treasure Valley. We set out 12 traps at various locations from near Melba to near Weiser. I am checking the traps every few days and posting the moth counts to this website. Below are the moth counts from this week . Purdue University recommends the treatment threshold to be 10 moths per trap per night. The growing degree day model from Oregon State University is predicting moths will begin laying eggs in fresh corn silk in late July to early August with the egg hatch beginning a few days later.
Date: 7/21/09 to 7/27/09
Location # of Moths caught
South ofWeiser 1 --- 0
South ofWeiser 2 --- 1
NW of Middleton --- 2
North of Wilder --- 7
South of Homedale 1 --- 1
West of Caldwell --- 1
East of Homedale 2 --- 1
NE of Marsing --- 0
North of Melba --- 0
East of Kuna 1 --- 0
East of Kuna 2 --- 0
East of Kuna 3 ---0
Total moths caught --- 13
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 16, 2009 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University GDD model for Corn Earworm (http://uspest.org/cgi-bin/ddmodel.pl?clm), we are currently at 956 GDD in the Caldwell area and 1003 GDD in the Parma area. We are accumulating approximately 22 GDD per day. We will hit 1300 GDD in the Caldwell area on approximately 8/1 and 1300 GDD in the Parma area on approximately 7/28. Those fields with fresh silk at 1300 GDD are most vulnerable to attack from corn earworm larvae.
The following information was taken from CIS 366 regarding corn earworm.
Corn can be “scouted” for corn earworm eggs to predict possible infestation levels. Examine 10 silk masses (about 2-day old) on each edge of a field but only in those fields which are beginning to silk or are silking. Examining a field in late silk for the first time is worthless; most of the eggs, if any were present, are already hatched, and the damage cannot be prevented.
When the egg counts average 1 egg per 2 silk masses, about 100% ear infestation will occur in the field and other fields of like maturity in the vicinity. With 1 egg per 2 silk masses, about 1 inch of each ear tip will be damaged; 1 egg per silk mass will result in about 2 inches of the ear tip damage, etc. When the days and nights are warmer than usual, the damage may double because the earworm will develop faster than the corn.
Fields should be scouted about every 2 to 4 days, depending on temperatures. Once economic egg levels are reached, determined on the basis of damage expected, further scouting is unnecessary. All fields which silk after that time in that vicinity will be subject to damage.
No chemical control will control worms in the ears, so sprays must be timed to control the larvae on the silk before the worms enter the ears. Make the first application when the plants are 50 percent silk, and repeat in 5 to 7 days or as necessary.
For control information from the 2009 Pacific Northwest Insect Management Handbook go to the following web address: http://uspest.org/pnw/insects. In the drop down boxes click on “commercial vegetables” and then “sweet corn.”
Update on corn earworm
Corn Treasure Valley - Idaho
Posted on: July 24, 2008 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University GDD model for Corn Earworm (http://pnwpest.org), we are currently at 1136 GDD in the Caldwell area, 1076 GDD in the Nampa area and 1297 GDD in the Parma area. We will hit 1300 GDD in the Caldwell area on 8/1, in the Nampa area we will hit 1300 GDD on 8/2, and in the Parma area we hit 1300 GDD on 7/24. Those fields with fresh silk at 1300 GDD are most vulnerable to attack from corn earworm larvae.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 16, 2008 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University GDD model for Corn Earworm (http://pnwpest.org), we are currently at 978 GDD in the Caldwell area, 927 GDD in the Nampa area and 1126 GDD in the Parma area. We are accumulating approximately 20 GDD per day. We will hit 1300 GDD in the Caldwell area on approximately 8/1, in the Nampa area we will hit 1300 GDD on approximately 8/2, and in the Parma area we will hit 1300 on approximately 7/23. Those fields with fresh silk at 1300 GDD are most vulnerable to attack from corn earworm larvae. We will hit 1300 GDD about 7-10 days later than last year.
The following information was taken from CIS 366 regarding corn earworm.
Corn can be “scouted” for corn earworm eggs to predict possible infestation levels. Examine 10 silk masses (about 2-day old) on each edge of a field but only in those fields which are beginning to silk or are silking. Examining a field in late silk for the first time is worthless; most of the eggs, if any were present, are already hatched, and the damage cannot be prevented.
When the egg counts average 1 egg per 2 silk masses, about 100% ear infestation will occur in the field and other fields of like maturity in the vicinity. With 1 egg per 2 silk masses, about 1 inch of each ear tip will be damaged; 1 egg per silk mass will result in about 2 inches of the ear tip damage, etc. When the days and nights are warmer than usual, the damage may double because the earworm will develop faster than the corn.
Fields should be scouted about every 2 to 4 days, depending on temperatures. Once economic egg levels are reached, determined on the basis of damage expected, further scouting is unnecessary. All fields which silk after that time in that vicinity will be subject to damage.
No chemical control will control worms in the ears, so sprays must be timed to control the larvae on the silk before the worms enter the ears. Make the first application when the plants are 50 percent silk, and repeat in 5 to 7 days or as necessary.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 26, 2007 by Jerry Neufeld
The next generation of corn earworm moths will lay eggs in the silk of corn between 1450 and 1650 growing degree days (GDD). GDD accumulations for Caldwell, Nampa and Parma respectively are 1468, 1377 and 1464. We are accumulating about 22 to 25 GDD per day. If you have corn silking during this time you will want to continue scouting for earworm eggs.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 13, 2007 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University GDD model for Corn Earworm (http://pnwpest.org), we are currently at 1189 GDD in the Caldwell area, 1107 GDD in the Nampa area and 1185 GDD in the Parma area. We are accumulating approximately 28 GDD per day. We will hit 1300 GDD in the Caldwell and Parma areas around July 17, and hit 1300 GDD in the Nampa area around July 21. Those fields silking at 1300 GDD are most vulnerable to attack from corn earworm larvae.
The following information was taken from CIS 366 regarding corn earworm.
Corn can be “scouted” for corn earworm eggs to predict possible infestation levels. Examine 10 silk masses (about 2-day old) on each edge of a field but only in those fields which are beginning to silk or are silking. Examining a field in late silk for the first time is worthless; most of the eggs, if any were present, are already hatched, and the damage cannot be prevented.
When the egg counts average 1 per 2 masses, about 100% ear infestation will occur in the field and other fields of like maturity in the vicinity. With 1 egg per 2 silk masses, about 1 inch of each ear tip will be damaged; 1 egg per silk mass will result in about 2 inches of the ear tip damage, etc. When the days and nights are warmer than usual, the damage may double because the earworm will develop faster than the corn.
Fields should be scouted about every 2 to 4 days, depending on temperatures. Once economic egg levels are reached, determined on the basis of damage expected, further scouting is unnecessary. All fields which silk after that time in that vicinity will be subject to damage.
No chemical control will control worms in the ears, so sprays must be timed to control the larvae on the silk before the worms enter the ears. Make the first application when the plants are 50 percent silk, and repeat in 5 to 7 days or as necessary.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 27, 2006 by Jerry Neufeld
The second generation of corn earworm moths will begin laying eggs in corn silking between 1450 and 1650 growing degree days (GDD). GDD accumulations for Caldwell and Parma are 1391 and 1461 respectively. We are accumulating about 25 GDD per day. If you have corn silking during this time period you will want to continue scouting for earworm eggs.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 21, 2006 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer moths will begin laying eggs in fresh corn silk at approximately 1300 GDD. Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm (http://pnwpest.org), we are currently at 1221 GDD in the Caldwell area and 1276 GDD in the Parma area. We are accumulating approximately 24 GDD per day. Those fields silking at 1300 GDD are most vulnerable to attack from corn earworm larvae. We should reach 1300 GDD in the next few days.
The following information was taken from CIS 366 regarding corn earworm.
Corn can be “scouted” for corn earworm eggs to predict possible infestation levels. Examine 10 silk masses (about 2-day old) on each edge of a field but only in those fields which are beginning to silk or are silking. Examining a field in late silk for the first time is worthless; most of the eggs, if any were present, are already hatched, and the damage cannot be prevented.
When the egg counts average 1 per 2 masses, about 100% ear infestation will occur in the field and other fields of like maturity in the vicinity. With 1 egg per 2 silk masses, about 1 inch of each ear tip will be damaged; 1 egg per silk mass will result in about 2 inches of the ear tip damage, etc. When the days and nights are warmer than usual, the damage may double because the earworm will develop faster than the corn.
Fields should be scouted about every 2 to 4 days, depending on temperatures. Once economic egg levels are reached, determined on the basis of damage expected, further scouting is unnecessary. All fields which silk after that time in that vicinity will be subject to damage.
No chemical control will control worms in the ears, so sprays must be timed to control the larvae on the silk before the worms enter the ears. Make the first application when the plants are 50 percent silk, and repeat in 5 to 7 days or as necessary.
corn earworm
Corn Treasure Valley - Idaho
Posted on: August 11, 2005 by Jerry Neufeld
The next generation of corn earworm moths will lay eggs in the silk of corn between 1450 and 1650 growing degree days (GDD). GDD accumulations for Caldwell, Nampa and Parma respectively are 1424, 1374 and 1462. If you have late silking corn you will want to continue scouting for earworm eggs.
Corn Earworm
Corn Treasure Valley - Idaho
Posted on: July 29, 2005 by Jerry Neufeld
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm (http://pnwpest.org) we are currently at approximately 1110 GDD in the Treasure Valley. Summer moths will begin laying eggs in fresh corn silk at approximately 1300 GDD. The GDD model is predicting egg hatch will begin on August 4. Those fields silking at this time are most vulnerable to attack. University of Idaho CIS 366 entitled “Timing Corn Earworm Control” states that “no chemical control will control worms in the ears, so sprays must be timed to control the larvae on the silk before the worms enter the ears. Make the first application when the plants are 50 percent silk, and repeat in 5 to 7 days or as necessary.”
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 19, 2005 by Jerry Neufeld
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm (http://pnwpest.org) we are currently at 941 GDD in Caldwell and 954 GDD in the Parma area. We are currently accumulating about 22 GDD each day. First generation summer moths will begin laying eggs in fresh corn silk at approximately 1300 GDD. Eggs will hatch a few days after reaching 1300 GDD and the larvae will then begin feeding on the ears. Those fields silking after 1300 are most vulnerable to attack.
The GDD model is predicting we will reach 1300 GDD on July 31 or August 1 and that earworm eggs will begin hatching about August 4 or 5 in both the Parma and Caldwell areas respectively. As we approach the start of egg hatch you will want to step up your field scouting and take the appropriate control measures to treat the larvae before they enter the corn ears.
corn earworm
Corn Treasure Valley - Idaho
Posted on: August 4, 2004 by Jerry Neufeld
The second generation of corn earworm moths will lay eggs in the silk of corn between 1450 and 1650 growing degree days (GDD). We are currently at approximately 1500 GDD. We will be at 1650 GDD on about August 11. It is important to continue scouting your corn fields for earworm eggs.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 26, 2004 by Jerry Neufeld
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm we are currently at 1313 GDD in the Caldwell area. Maximum numbers of first generation moths should be laying eggs in corn silk now.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 19, 2004 by Jerry Neufeld
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm we are currently at 1070 GDD in Caldwell and 1101 GDD in the Parma area. First generation moths will begin laying eggs in fresh corn silk at approximately 1300 GDD. Eggs will hatch a few days after reaching 1300 GDD and the larvae will then begin feeding on the ears. The GDD model is predicting we will reach 1300 GDD at Caldwell on July 29 and at Parma on July 28.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 12, 2004 by Jerry Neufeld
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm we are currently at 971 GDD in Caldwell and 994 GDD in the Parma area. First generation moths will begin laying eggs in fresh corn silk at approximately 1300 GDD. Eggs will hatch a few days after reaching 1300 GDD and the larvae will then begin feeding on the ears. The GDD model is predicting we will reach 1300 GDD at Caldwell and Parma on about July 31. A few earworm larvae are already showing up in sweet corn fields in the Wilder area. As we approach 1300 GDD you will want to step up your field scouting and take the appropriate control measures.
western corn rootworm and wireworms
Corn Treasure Valley - Idaho
Posted on: June 8, 2004 by Jerry Neufeld
In the past few days I received a couple of calls about larvae feeding on corn roots and stems. In both cases the fields were a rotation of corn following corn. In one case the field had uncomposted manure applied to it. Be on the lookout for western corn rootworm larvae and/or wireworms in your cornfields, especially if you have fields in continuous corn, fields high in organic matter or corn following pasture or alfalfa.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 29, 2003 by Jerry Neufeld
The second generation of corn earworm will begin laying eggs in the silk of corn between 1450 and 1650 growing degree days (GDD). In the Caldwell area we will reach 1450 GDD on August 3. In the Parma area we will reach 1450 GDD tomorrow. It is still important to scout your corn fields for earworm eggs.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 21, 2003 by Jerry Neufeld
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm we are currently at 1139 GDD in Caldwell and 1272 GDD in the Parma area. First generation moths will begin laying eggs in fresh corn silk at approximately 1300 GDD. Eggs will hatch a few days after reaching 1300 GDD and the larvae will then begin feeding on the corn kernels. The GDD model is predicting we will reach 1300 GDD in Caldwell on July 27 and in Parma on July 22.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 14, 2003 by Jerry Neufeld
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm we are currently at 967 GDD in Caldwell and 1097 GDD in the Parma area. First generation moths will begin laying eggs in fresh corn silk at approximately 1300 GDD. Eggs will hatch a few days after reaching 1300 GDD and the larvae will then begin feeding on the corn kernels. The GDD model is predicting we will reach 1300 GDD in Caldwell on July 29 and in Parma on July 23. As we approach 1300 GDD you will want to step up your field scouting and take the appropriate control measures.
Wheat Curl Mite
Corn Treasure Valley - Idaho
Posted on: May 27, 2003 by Jerry Neufeld
Small numbers of Wheat Curl Mites have been found in a winter wheat field south of Nampa. Infestations of WCM usually occur in the fall; however, if conditions are just right they can overwinter and cause problems in the spring. WCM vector Wheat Streak Mosaic virus and High Plains Disease (HPD) in field and sweet corn. In 1993 HPD affected about 750 acres of sweet corn in Idaho with losses exceeding 50%.
WCM are distributed by wind currents and cannot go for more than about 24 hours without a living host plant. They must have a ?green bridge? in order to move from one living host to another. Hosts are cereals or young grasses in fields or adjacent to fields. In southwest Idaho HPD has been documented in sweet corn fields that were near a wheat field infested with WCM. The incidence of disease diminished as the distance from the wheat field increased. Please check out the Wheat Curl Mite reference page for more information.
corn earworm
Corn All Locations
Posted on: August 19, 2002 by Jerry Neufeld
Earworm in sweet corn seed has been a problem in the Treasure Valley this summer. The third generation was estimated to emerge at about 1450 to 1650 growing degree days (August 3 to August 15). Fourth generation emergence can?t be predicted with the current GDD model; however, it usually appears in late August to early September. Keep up your scouting program for this pest.
Corn Earworm
Corn All Locations
Posted on: July 29, 2002 by Jerry Neufeld
The next generation of corn earworm moths will begin laying eggs in the silk of corn between 1450 and 1650 growing degree days (gdd). In Nampa/Caldwell and Parma we are currently at 1389 and 1390 gdd respectively. The Oregon State University IPM model is predicting we will hit 1450 gdd in Nampa/Caldwell on August 2 and in Parma on August 1.
Corn Blotch Leafminer
Corn All Locations
Posted on: July 29, 2002 by Jerry Neufeld
A new corn pest, the corn blotch leafminer (Agromyza parvicornis), was discovered last week in a northeastern Idaho field near Rigby. To the best of our knowledge, this is the pest?s first occurrence in Idaho, although it has been reported previously in Southeastern and Midwestern states and, in 1995, in Nebraska. The current scientific literature indicates that corn is its only known host plant. Click on the "More Information" button for additional information and images.
corn earworm
Corn none
Posted on: July 23, 2002 by Jerry Neufeld
Numerous corn earworms are being found in sweet corn fields south of Lake Lowell and between Nampa and Caldwell. Worms are in the tassels and silk. Worms in the tassels are probably the first generation. Worms in the silk are probably the second generation. Infestations are severe enough to require treatment. Information provided by Producer's Supply Coop.
cereal leaf beetle
Corn none
Posted on: July 16, 2002 by Jerry Neufeld
Large numbers of adult cereal leaf beetles are being found in sweet corn seed fields that border spring wheat fields. Beetles seem to concentrate on corn plants that are under stress. Thanks to Fred Butler for this information.
cereal leaf beetle
Corn All Locations
Posted on: July 15, 2002 by Jerry Neufeld
Greg Willison, Chiquita Farms (New Plymouth) has been observing adult CLB infestations and feeding damage in field corn. Damage is most severe in corn fields adjacent to small grains, especially small grains that were not treated for CLB.
Adult CLB infestations of field corn are rarely of economic significance. However, growers may become alarmed at the amount of damage, especially near the field borders. The following web address links to a publication from Virginia Tech that has a section on CLB in field corn: http://ipm-www.ento.vt.edu/nipmn/VA-IPM/cereal_leaf_beetle/clb.html. In that publication it says:
"Adults emerge as the small grain crop is drying and migrate to other areas to find suitable food. Often, corn fields bordering small grain fields are attractive to the migrating beetles and these adults colonize the corn, especially along the edges nearest small grain. Cereal leaf beetles eat the leaf surface tissue on whorl stage corn plants. Narrow streaks are eaten between the leaf veins, usually on the surface but sometimes completely through the leaf. If beetle populations are very high, defoliation can reduce yield, but leaf feeding is usually cosmetic. Damage is often alarming to farmers even if it poses no economic threat. Beetles do not reproduce or remain for a very long time in corn fields and, therefore, damage is a single, short-term event that rapidly developing corn plants soon out-grow."
There has been rare case of economic damage of CLB in field corn in the eastern U.S.
corn earworm
Corn All Locations
Posted on: July 15, 2002 by Jerry Neufeld
Second generation corn earworm moths will begin laying eggs in the silk of corn that is silking at about 1300 growing degree days (gdd). According the Oregon State University gdd model, we are at 1032 gdd in Nampa/Caldwell and 1032 gdd in Parma. We are accumulating about 23 gdd per day. The model predicts we will be at 1300 gdd about July 25, 2002.
There is a possibility that a few overwintering or first generation moths may be laying eggs in the silk right now. However, the greatest threat will come from the second generation moths. You will want to scout your fields and take control measures as needed.
Corn Rootworms
Corn none
Posted on: June 25, 2002 by Jerry Neufeld
Corn Rootworm larvae have been found in several field corn fields south of Kuna. Larvae will feed on root hairs and tunnel into the roots for about a month before they reach maturity. Adults feed on tender portions of the plant, especially pollen and silks. Thanks to Jim Hipwell from Bio Flora Northwest for providing this information.
wireworms
Corn All Locations
Posted on: May 10, 2002 by Jerry Neufeld
Wireworms are damaging sweet corn seed fields in the Melba area. According to the literature, corns fields following pasture or alfalfa are most prone to wireworms. Information provided by Terry Drye.
Corn Earworm
Corn All Locations
Posted on: July 22, 2001 by Jerry Neufeld
The growing degree day (gdd) totals for corn earworm through July 25, 2001 are:
Caldwell-1360
Nampa-1359
Parma-1634
The next generation of corn earworm will lay eggs between 1450 and 1650 gdd. The OSU model predicts Caldwell and Nampa will reach 1450 gdd on July 30.
corn earworm
Corn All Locations
Posted on: July 19, 2001 by Jerry Neufeld
Corn earworm moths will begin laying eggs in the silk of corn that is silking at about 1300 growing degree days(gdd). According the Oregon State University Model, we are at 1247 gdd in Caldwell and 1242 gdd in Nampa. At Parma we are at 1493 gdd which is the time for second generation egg laying. You will want to scout fields take control measures as needed.
Corn Earworm
Corn All Locations
Posted on: July 13, 2001 by Jerry Neufeld
Corn earworm moths will begin laying eggs in the silk of corn that is silking at about 1300 growing degree days (gdd). According the Oregon State University Model, we are at 961 gdd in Caldwell and will reach 1300 gdd on approximately July 30. In Nampa we are at 1161 gdd and will reach 1300 gdd on approximately July 21. At Parma we are at 1300 gdd now. You will want to scout fields that are silking around 1300 gdd and take control measures as needed.
