By: J. Franklin Egan,David A. Mortensen
Recent advances in biotechnology have produced cultivars of corn, soybean, and cotton resistant to the synthetic-auxin herbicide dicamba. This technology will allow dicamba herbicides to be applied in new crops, at new periods in the growing season, and over greatly expanded areas, including postemergence applications in soybean. From past and current use in corn and small grains, dicamba vapor drift and subsequent crop injury to sensitive broadleaf crops has been a frequent problem. In the present study, the authors measured
dicamba vapor drift in the field from postemergence
applications to soybean using greenhouse-grown soybean as a bioassay system.
They found that when the volatile dimethylamine formulation is applied, vapor
drift could be detected at mean concentrations of 0.56 g acid
equivalent dicamba/ha (0.1% of the applied rate) at 21 m away from a
treated 18.3 × 18.3 m plot. Applying the
diglycolamine formulation of dicamba reduced vapor drift by 94.0%. With the
dimethylamine formulation, the extent and severity of vapor drift was
significantly correlated with air temperature, indicating elevated risks if
dimethylamine dicamba is applied early to midsummer in many growing
regions
Recent advances in biotechnology have produced cultivars of corn, soybean, and cotton resistant to the synthetic-auxin herbicide dicamba. This technology will allow dicamba herbicides to be applied in new crops, at new periods in the growing season, and over greatly expanded areas, including postemergence applications in soybean. From past and current use in corn and small grains, dicamba vapor drift and subsequent crop injury to sensitive broadleaf crops has been a frequent problem. In the present study, the authors measured
dicamba vapor drift in the field from postemergence
applications to soybean using greenhouse-grown soybean as a bioassay system.
They found that when the volatile dimethylamine formulation is applied, vapor
drift could be detected at mean concentrations of 0.56 g acid
equivalent dicamba/ha (0.1% of the applied rate) at 21 m away from a
treated 18.3 × 18.3 m plot. Applying the
diglycolamine formulation of dicamba reduced vapor drift by 94.0%. With the
dimethylamine formulation, the extent and severity of vapor drift was
significantly correlated with air temperature, indicating elevated risks if
dimethylamine dicamba is applied early to midsummer in many growing
regionsYangzhou pioneer chemical CO.,LTD
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