PLICTRAN AS AN ORCHARD ACARICIDE IN BRITISH COLUMBIA

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Abstract
Plictran (tricyclohexyltin hydroxide) was very effective against the European red mite, Panonychus ulmi (Koch), and the apple rust mite, Aculus schlechtendali (Nalepa), when applied at the pink bud stage of apple bud development. Plictran as a summer spray was not so effective because a small number of phytophagous mites survived. Plictran, however, is low in toxicity to the predaceous phytoseiids Metaseiulus occidentalis (Nesbitt) and Typhloseiopsis sp. near arboreus (Chant), and these predators increased on the surviving phytophagous mites. Because of this selective action, Plictran is a very promising acaricide for use in integrated mite control programs.