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Agronomy Talk

S. Illinois & Missouri

Well-timed Herbicide Applications Are Key

Published on Tuesday, July 01, 2014

Well-timed herbicide applications are key to a successful crop and managing resistance. To reduce the potential for weed reproduction and yield loss, it is best to start and stay clean throughout the season. As temperatures warmed up, the winter annual weeds became more noticeable. Burndown applications were made to control them in corn and soybeans, and herbicides were applied to wheat. Preplant/pre-emergence residual applications were also made to prevent weed growth in the early part of the growing season. So how do we maintain that control? Timely post-emergence applications of herbicides are critical to maintaining good weed control. Glyphosate resistant weed species like marestail, waterhemp and Palmer amaranth are difficult to control and must be sprayed prior to reaching a height that reduces herbicide effectiveness. Using herbicides with multiple sites of action are more effective for control as well as preventing further resistance of these weed species. Remember to scout your fields this season to control the weeds before they control your yields.

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