Timing and Evaluation of Pesticides for Control of the Pear Rust Mite2

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Abstract
Field studies on timing of application and effectiveness of materials against Epitremerus pyri (Nalepa) were conducted during 1966 and 1967 in southern Oregon pear orchards. The degree of fruit russet increased with the time the trees were left unsprayed. Delayed dormant or pink bud applications of endosulfan resulted in an absence of economic injury at harvest, but when treatment was delayed until Mayor later, severe fruit injury was evident. Oil used alone or oil-organophosphate combinations applied prebloom effectively suppressed rust mite densities. Other materials found effective included: Carzol® (N′- (chloro-0-tolyl) -N, N- dimethyIformamidine hydrochloride). dimethoate, carbofuran, maneb, Morestan ® (6-methyl-2,3-quinoxalinedithiol cyclic S, S-dithiocarbonate), Temik® (a 10% granular formulation of UC-21149 (2-methyl-2-(methylthio) propionaldehyde 0-(methylcarbamoyl) oxime) ), and zineb.

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