2021
Pyrethroid Resistant Soybean Aphids and Soybean Gall Midge Survey
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Contributor/Checkoff:
North Dakota Soybean Council
Category:
Sustainable Production
Keywords:
Biotic stressCrop protectionField management Pest
Parent Project:
Pyrethroid Resistant Soybean Aphids, Drones for Insect Scouting and Detection of Invasive Soybean Gall Midge
Lead Principal Investigator:
Janet Knodel, North Dakota State University
Co-Principal Investigators:
Project Code:
QSSB
Contributing Organization (Checkoff):
North Dakota Soybean Council
$31,670
Institution Funded:
North Dakota State University
$31,670
Brief Project Summary:

Pyrethroid-resistant soybean aphids were confirmed in eastern North Dakota, and continues to threaten effective pest management of this pest. The first goal of this research is to provide soybean growers with the facts needed to successfully manage pyrethroid-resistant soybean aphids in their fields, and to mitigate the development of resistance to other insecticides. The team will evaluate a broad range of registered insecticides with different modes of action to determine which are best for pyrethroid-resistant soybean aphid management. The second goal is to survey for the invasive soybean gall midge, which was recently discovered in neighboring states.

Key Benefactors:
farmers, applicators, crop scouts, entomologists

Information And Results
Project Deliverables

Results will be published in NDSC reports and trade magazines, NDSC podcasts and NDSU Extension's Crop & Pest Report.
Results also will be posted on the NDSU Extension Entomology and IPM websites.
Results will be presented at soybean extension and commodity meetings / field days.
A new NDSU Extension publication will be developed on IPM of soybean gall midge including its distribution in ND.

Final Project Results

Update:

View uploaded report PDF file

Soybean aphid is a major insect pest of soybeans in North Dakota. The goal of this research was to develop the best pest management (BPM) practices for insecticide resistant soybean aphids. Grower complaints of pyrethroid insecticides not controlling soybean aphids were common and widespread in eastern North Dakota during 2017. Laboratory bioassays confirmed that about 70% of the soybean aphid populations tested were resistance to pyrethroid insecticides. Soybean aphids are very mobile and pyrethroid resistant soybean aphids could migrate from other resistant areas, such as south-central Minnesota where the resistance first occurred in 2015. Since populations of soybean aphid can vary by year and locations, screening for pyrethroid resistant soybean aphids is key to determine their presence or absence, and their resistance status in North Dakota. In 2020, soybean aphid populations were low and present at non-economic levels, so no insecticide testing of new different modes of action could be tested against these pyrethroid resistant soybean aphids. This research is important for soybean growers, so they can wisely select which insecticide and mode of action to use against pyrethroid resistant soybean aphids. Insecticide resistant soybean aphids will continue to complicate pest management of soybean aphids for growers.

Our last objective was to survey for the invasive soybean gall midge, a new insect pest of soybeans. Soybean gall midge is now established in five states (Iowa, Minnesota, Missouri Nebraska and South Dakota) and has increased its distribution from a total of 67 counties in 2018 to 114 counties in 2020. Since it’s populations and severity are increasing in our neighboring states of Minnesota and South Dakota, growers need to know if soybean gall midge is present in North Dakota. A total of 605 soybean fields were inspected for soybean gall midge in 47 counties of the 53 counties in North Dakota (89% of the counties). Result of our 2020 soybean gall midge survey were negative for all soybean fields surveyed in North Dakota. This is good news for North Dakota soybean growers. Future survey work for soybean gall midge will be crucial for soybean production in North Dakota.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.