ID 308

Assessment of Commercial Scale Dicamba Drift Using Drift Reducing Adjuvants

 

Abstract:

Off-target dicamba movement has been shown to be reduced when drift reducing adjuvants are added to spray mixtures. OnTargetTM (AG16098) adjuvant is a patent-pending technology specifically designed for ultra and extra coarse nozzles, for use with the new dicamba herbicide chemistries. This adjuvant system has been formulated to reduce driftable fines when using the new dicamba formulations alone or in combination with glyphosate. OnTargetTM was listed as an approved DRA on both the Monsanto and BASF web sites in 2017. A commercial scale sprayer was used to assess the effects of different DRA materials when applied in windy field conditions. Data were collected downwind using repeated horizontal transects, water sensitive spray deposition cards and NDVI images from a fixed wing drone. In all instances where DRA’s were not used, off target drift far exceeded tolerable limits imposed by labeled buffer zone restrictions. Conversely, when DRA’s were added to a tank-mixture of dicamba and glyphosate, detectable and visible reductions in off-target movement were achieved