Short-term Effects of Three Insecticides on Predators and Parasites of the Citrus Blackfly 12

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Abstract
The effects of 3 organophosphate insecticides, acephate, malathion, and methidathion, on predators and parasites of Aleurocanthus woglumi Ashby, the citrus blackfly, were studied under field conditions. Acephate and malathion are currently the insecticides used in the joint federal-state citrus blackfly eradication program and methidathion is currently one of the insecticides commonly used by commercial citrus growers in Florida. Highly significant reductions ( P 0.05) reduction. Numbers of the predator Delphastus pusillus (Le Conte) (Coleoptera: Coccinellidae) were significantly ( P D. pusillus ) were grouped together and treated as one biological unit. There was no significant change in the general predator complex noted after single applications of either acephate, malathion, or methidathion. Two laboratory bioassays, one using leaves dipped in insecticide suspensions and one using leaves sprayed with 3 compounds, indicated that emergence of A. hesperidum is not significantly reduced by one treatment of acephate but is reduced by one treatment of either malathion or methidathion.

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