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Lessons Learned from Preemergence Corn Herbicide Research this Spring

Note: The following two videos have been produced by UMN Extension Educators for Crops who are based in Rochester, MN. The message regarding preemerge herbicides is valuable. The two videos presented here provide a review of herbicide performance in corn, the first from May 27, 2017; the second is a follow-up posted June 8, 2017. I hope you find them informative when considering your own preemerge and post emerge herbicide program planning.
Phillip Glogoza, UMN Extension Educator for Crops
Extension Regional Office - Moorhead

by Ryan Miller and Lisa Behnken

Last week, we shared a video on Spring herbicide activity concerns due to cool and wet conditions following preemergent corn herbicide applications (Spring herbicide activity concerns -- May 27, 2017). In the video, we noted that weeds were coming through and wondered if the preemergent herbicides that had been applied would do their job. 

We are back in the research plots in Rochester and checking-in to see how things have been progressing over the past week. In this week's video, we're sharing some interesting observations. 

We have seen differences in the time it takes for different preemergent herbicides to activate, and differences in "reach-back" with different herbicide products. We have also seen the benefit of preemergent herbicides in taking some of the pressure off of postemergence applications by providing at least some of our weed control, and by extending the window to accomplish postemergence applications. 

To view this week's video, Spring herbicide activity progress, visit We will be following this trial during the 2017 growing season and providing periodic video updates.

Spring herbicide activity concerns, May 27, 2017

Spring herbicide activity progress, June 8, 2017

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