Abstract
Abstract 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 spray of the insecticide pirimiphos-methyl, applied pre- or post blossom, were also investigated. Mancozeb was harmful to T. pyri, adverse effects being apparent after two or three sprays. Thiophanate-methyl significantly reduced numbers of T. pyri in one experiment. The mixtures of mancozeb or thiophanate-methyl with chlorpyrifos were more harmful than either product alone. Pirimiphos-methyl, even when applied pre-blossom at the mouse ear growth stage, was harmful leading to increases in pest mite populations.
Published Version
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