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A laboratory bioassay and field trials were used to evaluate the effect of 31 pesticides on Aphelinus mali, a parasitoid of woolly apple aphid. Adults were caged for 16 hours in Petri dishes containing treated filter paper. Carbaryl, chlorpyrifos, diazinon and pyrethrum were highly toxic, while azinphos-methyl and omethoate showed low to moderate toxicity. In a field study, orchard blocks were treated with chlorpyrifos plus oil, buprofezin plus oil, oil, diazinon, carbaryl and pirimicarb. The number of adultA. mali caught in white sticky traps was reduced in the chlorpyrifos and carbaryl treatments. The implications for woolly apple aphid control in an Integrated Fruit Production programme are discussed.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Effect of orchard pesticides on <i>Aphelinus mali</i>, the woolly apple aphid parasitoid