Fungicides for control of powdery mildew in apple and cherry were evaluated for their effects on phytophagous and predaceous mites. The fungicide, Benlate, and acaricides, Vendex and Pyramite, exhibited miticidal effects on twospotted spider mite (Tetranychus urticae) and western predatory mite (Galendromus occidentalis) after five days of exposure to residues in modified Munger cells. Benlate slightly decreased adult survival and significantly suppressed reproduction of both mites. No fungicides evaluated significantly decreased the number of T. urticae consumed by G. occidentalis. The DMI fungicides, Procure and Rally, and the strobilurin, Flint, had no negative effects on T. urticae or G. occidentalis survival, reproduction, or consumption of T. urticae by G. occidentalis.
Species 1: Acari Tetranychidae Tetranychus urticae (twospotted spider mite)
Species 2: Acari Phytoseiidae Galendromus occidentalis (western predatory mite)
Keywords: strobilurin fungicide, demethylation-inhibiting fungicide
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