Abstract
Lambda-cyhalothrin was tested in field cages at two rates (5 and 10 g/ha) and in white clover (Trifolium repens) field plots at 10 g/ha. Both rates significantly reduced nymph and adult potato mirid (Calocoris norvegicus) and aphid (Acyrthosiphon spp.) numbers up to 12 and 20 days after treatment (DAT), respectively in the cages. Numbers of aphids and potato mirid nymphs were significantly lower in the 10 g/ha treated cages up to 12 DAT. Aphid numbers were significantly reduced in the lambdacyhalothrin treated field plots up to 7 DAT, but there was no difference in potato mirid adult numbers between the treated and control plots. Of the common aphid predators collected, ladybird (Coccinella undecimpunctata) numbers were adversely affected by lambda-cyhalothrin application up to 14 DAT, while Tasmanian lacewing (Micromus tasmaniae) and harvestmen (Phalangium opilio) numbers were not reduced.
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