Minnesota Corn, Soybeans: Late-Season Pest Considerations – Podcast

Thistle caterpillar leaf feeding and webbing. Photo: Bruce Potter, University of Minnesota

In this week’s podcast, we feature Angie Peltier, UMN Extension Educator based out of Crookston, MN. Peltier provided insight on conditions in Northwestern Minnesota and the outlook into the remainder of the growing season for corn and soybeans.

Diseases in corn, such as Goss’s wilt or blight, have become a concern in some areas. It primarily affects leaves, preventing photosynthesis. As a bacterial disease, fungicides are not effective as a treatment, though crop genetics could play a role in reducing risk.

One insect gaining attention across the state this year in soybean is thistle caterpillar, or the painted lady butterfly, which has been found in northwestern MN fields too. Larvae can cause defoliation of leaves in high numbers. Economically damaging levels only occur above 20% defoliation in reproductive stage (e.g., flowering) soybean when larvae are still present.

This podcast was hosted by Dave Nicolai, Crops Extension Educator & Coordinator for the Extension Institute for Ag Professionals. Special thanks to Anthony Hanson, Extension Post-Doctoral Associate for recording and technical assistance. The purpose of the IPM podcasts is to alert Growers, Ag Professionals and Educators about emerging pest concerns on Minnesota field crops. We also review recent pest trends and research updates.


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