Abstract
Pesticide application to fruit crops such as apples and grapes requires adjustment of thesprayer to direct spray into the canopy zone as it develops over the growing season. The objective ofthis study was to investigate the impact of nozzle orientation on vertical spray patterns at the centerof the grapevine row, using an air-blast sprayer. The interaction between nozzle orientation andairflow was also studied. Results have shown potential for improving deposition and reducing spray drift by carefullyadjusting the nozzle orientation. It was also observed that adjustments in nozzle orientation on twosides of the sprayer should be independent and in consideration of airflow rate and direction on eachside. Orientation of the nozzles to counteract the blast of air in the vicinity of the sprayer air outlethave shown improvements not only in better targeting of sprays to canopies but also in improvinguniformity of deposition between heights. Correct orientation of nozzles has shown to enhance theeffect of air assistance of the sprayer.
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