Harvest Aid Applications in Soybeans

Aug 18, 2022

By Jeremy Kichler

I have received this question a couple of times this week from growers and retailers with indeterminate soybeans. According to the soybean weed control section of the 2022 UGA Pest Management Handbook, paraquat can be applied to soybeans based on the following instructions. The paraquat rate according to this reference is 0.25 lb ai per acre which is 16 oz of 2 lb formulation.

Indeterminate Varieties: Apply when at least 65% of the seed pods have reached a mature brown color or when seed moisture is 30% or less.
Determinant Varieties: Apply when soybeans are fully mature (full pod development, 50% leaf drop, and the remaining leaves are yellow).
Mature cocklebur and drought stressed weeds are not adequately controlled by this treatment. Do not apply to immature soybeans. Add a nonionic surfactant at 0.25% v/v. May be ground or aerially applied. Tank-mix with Aim if annual morningglories are also a problem (except smallflower).

Source : uga.edu

Video: Wisconsin Corn and Soybean Weed Management Updates and Considerations for 2026 and Beyond

Dr. Rodrigo Werle, associate professor and extension weed scientist, UW–Madison, shares the latest updates and future considerations for corn and soybean weed management in Wisconsin. This presentation covers herbicide resistance trends in waterhemp, including newly confirmed cases of HPPD and S-metolachlor resistance, and emphasizes the importance of residual herbicides and strategic tank mixes for consistent control. Rodrigo also introduces upcoming technologies like Vyconic soybeans and new herbicide products, discusses integrated weed management strategies such as planting green with cover crops, and highlights practical recommendations for 2026 and beyond.

At University of Wisconsin–Madison Division of Extension, we are working to integrate accessibility into our web, video, and audio content. If you experience accessibility barriers using our web, audio, or video content or would like to request complete captions, alternative languages, or other alternative formats, please contact us at accessibility@extension.wisc.edu. You will receive a response within 3 business days. There’s no added cost to you for these services.

The University of Wisconsin-Madison Division of Extension provides equal opportunities in employment and programming in compliance with state and federal law.