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Water hemp weed might be exhibiting glyphosate resistance (Aug. 21, 2001 – CropChoice news) – The weed water hemp might be gaining resistance to the herbicide Roundup (glyphosate), says a University of Missouri-Columbia weed scientist.
Water hemp, the most common weed in Missouri soybean, had surprised a couple of the state’s farmers by showing resistance to glyphosate. They found it in Roundup Ready soybean fields that they had sprayed repeatedly with Roundup.
Weed scientist Reid Smeda collected sample of the weed for testing. He found that 4 to 5 percent of the water hemp survived applications of glyphosate, no matter the dosage.
He suggests that farmers rotate their crops, avoiding repeated plantings of Roundup-resistant soybeans.
Source: Kansas City Star
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