The effect of sprays on the fauna of apple trees. I. The influence of winter wash, captan, and lime-sulphur on the interaction of populations of Panonychus ulmi (Koch) (Acarina: Tetranychidae) and its predator, Blepharidopterus angulatus (Fall.) (Heteroptera: Miridae)

Muir, R.C.

J. appl. Ecol. 2: 31-41


DOI: 10.2307/2401691
Accession: 014736788

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Part 1: The influence of routine sprays of winter wash (0.1 % DNOC+3.0% petroleum oil), lime-sulphur and captan on populations of P. ulmi and its predators was studied from 1953 to 1959 in a 5-acre apple orchard. During this period there were 2 marked fluctuations in the populations of both P. ulmi and B. angulatus, the only predator present in numbers.