The aim of the application of phytosanitary products is to reach the target in order to control pests.
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Evaluation of three adjuvants in wind tunnel: their effect on drift
Weather conditions during application, especially wind speed and direction, affect off-target movement. Unintentional drift of agrochemical sprays may result in adverse environmental impact and also in ineffective pest control. One way to minimize drift is to use spray additives which increase spray droplet size. In this research, three commercial and experimental products were evaluated in order to study which one had the best performance to reduce drift. They were: polyacrylamide to 30% (A), polyacrylamide-based compound to 35% (B) and Light Hydrotreated Petroleum Destillated CAS 64742-47-8 (C). They were used at different concentrations and pure water as reference. Spray nozzles were arranged in a parallel and perpendicular way to wind direction into the tunnel. The following measures were made on each product: spray flow, spray drift and distribution pattern in order to obtain the graphical representations. Significant differences were observed in spray drift between treatments (products) and wind direction. Product B behavior was suitable as a reducing agent of the drift, even lower than the reference value, under tested conditions.