Giant ragweed is a summer annual known for inducing allergies across the Midwest. Beyond its ability to cause misery in humans, however, the weed can do significant damage to ROI. According to Michigan State University Extension, one giant ragweed plant per 10 square feet can reduce corn yield by 55% and soybean yield by 52%.1
A weed control program with multiple modes of action can help control giant ragweed. A strong program should consist of a burndown or tillage, followed by preemergence and postemergence applications that include residual activity. When choosing solutions, keep in mind giant ragweed is resistant to glyphosate (Group 9) and Group 2 active ingredients.
1Giant Ragweed: https://www.canr.msu.edu/weeds/extension/giant-ragweed
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