Influence of Simulated Rains on Phosmet Residues and Oriental Fruit Moth (Lepidoptera: Tortricidae) Control on Peach

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Abstract
Simulated rainfalls of 11 to 17 mm accelerated losses of phosmet residues for up to 6 days after spray applications. At low application rates (0.6 kg [AI]/ha) significant reductions in mortality of Grapholitha molesta (Busck) larvae occurred when water was applied during the first 3 days post application. Effects of residue losses were delayed: significant reductions in mortality of G. molesta did not occur until 3 to 6 days after simulated rains. Although simulated rains also removed phosmet from higher deposits, effects on mortality of larvae were not significant. Application of phosmet at 1.1 kg (AI)/ha, which provided control of larvae for 7 to 10 days and did not require respraying when exposed to simulated rains, was judged optimal.