Pyrethroid Resistant Soybean Aphids and Soybean Gall Midge Survey
Sustainable Production
Biotic stressCrop protectionField management Pest
Lead Principal Investigator:
Janet Knodel, North Dakota State University
Co-Principal Investigators:
Project Code:
NDSC 2024 Agr 14
Contributing Organization (Checkoff):
Institution Funded:
Brief Project Summary:
The project conducts research on alternative insecticides for soybean aphid and grasshopper control in soybeans, and which products are more economical and safer for beneficial insects. Due to insecticide resistant soybean aphids in eastern North Dakota, farmers are finding that pyrethroid insecticides were not performing well. Another part of this project is to survey for new pests of soybean including the soybean gall midge and soybean tentiform leafminer in the state. Extension outreach products also are produced to help educate farmers and other stakeholders.
Key Beneficiaries:
#ag chemical company representatives, #agronomists, #crop consultants, #extension specialists, #Farmers, #pesticide applicators, #scouts
Unique Keywords:
#aphids, #grasshoppers, #insecticides, #insects and pests, #soybean gall midge, #soybean pests, #soybean tentiform leafminer
Information And Results
Project Summary

Pyrethroid resistant soybean aphids continues to threaten effective pest management of soybean aphids in eastern ND. The first goal of this research is to provide soybean growers with ‘updated’ insecticide efficacy for successful management of pyrethroid resistant soybean aphids in their fields, and to mitigate the development of resistance to other insecticides. By understanding which insecticides manage pyrethroid resistant soybean aphids, soybean yields can be maximized. We will evaluate a broad range of registered and experimental insecticides with different modes of action. The second goal of this research is to continue survey work for new insect pests of soybean including the soybean gall midge and the soybean tentiform leafminer. Soybean gall midge was confirmed in Sargent County, ND in 2022. In summary, this research will identify the best management practices for pyrethroid resistant soybean aphids and determine the geographical distribution and pest status of soybean gall midge and soybean tentiform leafminer in ND. By understanding the producer’s increasing risk of insecticide resistant soybean aphids, management of soybean aphids can be optimized through Integrated Pest Management (IPM) and increase soybean profits. Survey work for the invasive and destructive soybean gall midge is crucial so that soybean producers are aware of its current distribution and pest density in ND.

Project Objectives

1) To determine which insecticides and mode of actions are the best tools for management of pyrethroid resistant soybean aphids.
2) To continue survey work for the detection of new soybean pests, soybean gall midge and soybean tentiform leafminer.
3) To develop extension outreach material on soybean insect pests for NSDC and growers.

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 and IPM websites.
• Results will be presented at soybean extension and commodity meetings and field days.
• New soybean insect outreach materials will be provided to NDSC for soybean growers, agronomists, scouts, extension agents/specialists and others.

Progress Of Work


View uploaded report PDF file

Updated July 2, 2024:

View uploaded report PDF file

Final Project Results

Updated July 2, 2024:

Benefit To Soybean Farmers

Objective 1: We propose to be proactive in detecting developing insecticide resistance in populations of soybean aphids in eastern North Dakota. Insecticide resistance in populations of soybean aphids will complicate control decisions for producers, and potentially increase costs and decrease net returns. Producers need to know which insecticide products will control pyrethroid resistant soybean aphids, since economic aphid populations are known to cause significant yield losses of over 50% if not managed.

For the 2nd objective, a detection survey will be conducted in southeastern ND to determine the geographical distribution and prevalence of soybean gall midge and soybean tentiform leafminer in ND soybean fields.

The 3rd objective will provide a ‘new’ soybean insect pest publication for use by the NDSC, soybean growers and NDSU Extension. The outdated NDSU Extension Soybean Aphid IPM publication will be updated with new research information.

An Integrated Pest Management (IPM) approach will benefit the ND soybean industry by minimizing pesticide costs, soybean pest damage, and risks of pests developing pesticide resistance, thereby increasing soybean productivity.

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.