Abstract
High spray deposition efficiencies by orchard sprayers are necessary with increases in pesticide costs and general concern for environmental protection. Lower nozzle pressure (7.4 kg/cm2) produced higher mean total deposits of permethrin on both glass slides and trees than 28.1-kg/cm2 nozzle pressure, but the deposits were only significantly higher on the glass slides. There was no significant difference in total mean deposits on both trees and slides for application rates of 301 and 718 liters/ha. Both 301- and 718-liter/ha application rates produced higher mean total deposits than the 167-liter/ha rate on both slides and trees, but the deposits were significantly higher only on the slides. There was no significant difference between deposits on glass slides with WP and EC formulations of permethrin.
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