Orchard Mite Control Experiments in Western New York1

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Abstract
Paratetranychus pilosus, Tetranychus bimaculatus, Bryobia praetiosa, and Septanychus sp. occur in N. Y., but only the first 2 are of general economic importance P. pilosus is active in mid-summer; winter eggs are readily killed with dormant or semi-dormant spray applications of either a 2% petroleum oil or 0.5% commercial formulation containing dinitro sec. butyl phenol or dinitro amyl phenol. Best results were obtained with the oil treatment. In summer tests, parathion gave 95-99% kill of hatched mites at 0.0156%, but 0.03125% was required to kill mites hatching from eggs present at treatment time. T. bimaculatus is most abundant in Aug. Control of both P. pilosus and T. bimaculatus for a period of 4 weeks was effected by a single spray of p-chlorophenyl p-chlorobenzene sulfonate at 0.25%. Hydrated lime inactivated, acaricidally, DN-111 (dicyclohexylamine, salt of dinitro-o-cylohexyl- phenol).

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