Abstract
The predaceous mite Typhlodromus occidentalis Nesbitt (Acarina: Phytoseiidae ) was found to survive applications of several insecticides, fungicides, and horticultural sprays used on apple in Washington. A program which integrates the chemical control of insects with the biological control of mites has been established by selecting those chemicals which conserve T. occidentalis . The primary goal of the integrated program was the control of the McDaniel spider mite, Tetranychus mcdanieli McGregor (Tetranychidae), by Typhlodromus occidentalis . If Telranychus mcdanieli was the only food present for the predator, a cyclic predator: prey response developed. If the apple rust mite, Aculus schlechtendali (Nalepa) (Eriophyidae), was available, Typhlodromus occidentalis fed on it, but did not control this species. Under the latter conditions Tetranychus mcdanieli rarely became numerous. Populations of the European red mite, Panonychus ulmi (Koch) (Tetranychidae), were reduced by chemicals in the early part of the season and predation by Typhlodromus occidentalis prevented a later resurgence of populations of this species.
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