Tillage is one option for destroying emerged glyphosate-resistant horseweed before planting, but there are no herbicide options to control it after planting when weeds reach this size, says Purdue University weed scientist Bryan Young. Hand pulling is the only option to prevent seed production.
“Do we need to till or not?” Purdue University weed scientist Bryan Young often hears this question from Midwest soybean growers fighting herbicide-resistant marestail, waterhemp and Palmer amaranth. In parts of the south, multi-herbicide-resistant Palmer pigweeds have forced growers to include or intensify tillage, Young says. Likewise, in western Kansas, glyphosate-resistant kochia has led some dryland wheat growers to resort to tillage. But before Midwest farmers put steel to ...
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