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Permalink Weed Scientists Caution about Auxin Herbicide Drift

Scientists with the Weed Science Society of America (WSSA) say special precautions are necessary to prevent off-target plant damage from dicamba and 2,4-D drift. A survey of more than 2,300 commercial and noncommercial applicators showed that less than half were familiar with volatility and temperature inversions that can influence off-target movement of the auxin herbicides. The Take Action on Weeds program has produced a new fact sheet with best management practices for auxin herbicides, which warns that many ornamental, vegetable, and tree species are sensitive to auxins at 1/30,000 of the labeled rate. It also cautions that vapor drift of auxin herbicides can occur up to three days after application. University of Missouri Associate Professor Kevin Bradley notes, "The approved product labels have considerable detail on management of drift and other risks and must be carefully followed to reduce off-site movement. Unless growers show they can use these herbicides as labeled, the registrations could easily be revoked."

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