Effects of Rainfall on Persistence of Phosmet Residues on Peach: Implications for Integrated Pest Management Programs

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Natural or artificial rainfall of 15 to 18 mm during the first 24 h after applications of low rates of phosmet increased losses of deposits by 20 to 30%. Losses also were accelerated when rains occurred 6 to 7 days after applications. Control of the Oriental fruit moth, Grapholitha molesta (Busck), was reduced, and a need to respray was indicated. However, the necessity to respray was not immediate, because reduced residues were effective for 2 to 6 days, vs. the normal 7 to 10 days. Thus, respraying could be delayed 3 to 4 days. The results suggest that when deposits of phosmet were reduced to the minimum necessary for control of Oriental fruit moth, rains of relatively small quantities significantly affect the control obtained.

Document Type: Research Article

Publication date: October 1, 1981

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