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In experiments in a commercial apple orchard in southern England in 1992 and 1993, the effects of a series of four or five foliar sprays of the insecticides chlorpyrifos or carbaryl, or of the fungicides thiophanate-methyl or mancozeb, or of mixtures of each insecticide with each fungicide, on populations of the orchard predatory mite Typhlodromus pyri Scheuten were examined. The effects of a single...