The off-target movement of dicamba was a hot topic at last week’s Weed Science Society of America annual meeting. The academic community cited volatility as a major contributor to off-target damage. Environmental conditions, like warm, humid weather and temperature inversions, made volatility more likely. University of Arkansas weed scientist Jason Norsworthy also discussed the possibility of “atmospheric loading;” a situation where large amounts of dicamba are sprayed in a short time. Norsworthy made a comparison to smog in Los Angles. Northeast Arkansas, the bootheel of Missouri and western Tennessee were highlighted as areas with “atmospheric loading” of dicamba.
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