European Red Mite Control

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Abstract
During the past 15 years, Maine apple growers have changed from the use of lime-sulfur spray to a program of wettable S sprays and S dust for the control of apple scab (Venturia inequalis). Simultaneously there have been increasingly frequent and severe infestations of European red mite (Paratetranychus pilosus) and of oyster-shell scale (Lepidosaphes ulmi), probably as a result of the destruction of many natural enemies of the pests by the greater number and increased thoroughness of the S applications. If apple scab is controlled during the critical period preceding petal fall, later infection can be held in check by a comparatively weak fungicide. By using even a comparatively weak acaracide in every application after petal fall, severe infestations of red mite can be prevented. Two promising materials (dinitro capryl phenyl crotonate and a mixture of glyoxalidines) are reported to have controlled both scab and red mite when used in each application through the post-bloom period.

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