Spray Drift Mitigation with Spray Mix Adjuvants

Abstract

Numerous drift reduction adjuvants and spray deposition aids are available to applicators of crop production and protection chemicals. Performance of many of the newly introduced drift control adjuvants has not been well documented for aerial application. Four new drift control adjuvants were selected for drift studies in aerial applications. Deposition, downwind drift, and droplet spectra characteristics in a cotton canopy were collected on water sensitive paper (WSP) and mylar cards for measurement and analysis. The deposition, droplet size, droplet coverage, and total drops were highly correlated to the drift distance and treatments or adjuvants. Deposition on the monofilament lines generally decreased as sampling height increased for each treatment. The results will aid aerial applicators in selecting drift reduction agents to meet the drift mitigation criterion for a given application.