Evaluating foliar insecticide efficacies for the soybean aphid and the impact of tillage and cover crops on seed treatment efficacies and insect populations
Sustainable Production
Biotic stressCrop protectionField management Pest
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Adam Varenhorst, South Dakota State University
Co-Principal Investigators:
Project Code:
Contributing Organization (Checkoff):
Institution Funded:
Brief Project Summary:

The first goal of this research is to continue to monitor soybean aphids for pyrethroid resistance, and determine the efficacy of insecticides towards these pests. Researchers will sample fields in 12 additional counties to evaluate extent of their spread. The second objective is to evaluate the impact that tillage and cover crops have on fungicide, insecticide, and a combination of fungicide and insecticide seed treatments. There is ongoing discussion of their importance for Midwest soybean production. Current management recommendations assume that early season pests are generally not associated with economic injury in soybean fields.

Key Benefactors:
farmers, entomologists, applicators, ag retailers, extension specialists

Information And Results
Project Deliverables

This project will produce several deliverables during FY19, including management recommendations for the use of foliar insecticide, insecticide and fungicide seed treatments in no-till and cover crop soybean fields, and impacts on parasitic wasps.

The information that is generated through this project will benefit South Dakota soybean producers by providing:
(1) efficacy data that will be used to generate recommendations for foliar insecticides,
(2) management recommendations for the targeted use of seed treatments in different tillage regimes and cover crop settings,
(3) evaluation of natural enemies’ value and application, and
(4) a greater opportunity to observe economic returns on input costs.

The deliverables will consist of fact sheets on insect resistance, early season insect pests and diseases that will be produced by SDSU faculty and published through iGrow. Weekly iGrow articles will inform producers on observations of current soybean insect pests or diseases and natural enemies with management strategies. A pocket identification guide for the soybean insects will be compiled and produced to provide producers with an effective method of learning how to scout, identify, and manage the pests associated with reductions of early season soybean stands. In addition, this project will provide training two M.S. graduate students, undergraduate students, research, and extension personnel. At least two peer-reviewed journal papers will be prepared from this research in fall of 2019.

The research on pyrethroid resistant soybean aphids has resulted in multi-state efforts to produce information regarding this issue. South Dakota is one of four states included on these publications.

Final Project Results

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.