Emergence of Parasites Associated with the Cabbage Aphid During a Chemical-Control Program

Abstract

The mortality of adult parasitic Hymenoptera caused by carbaryl, a contact insecticide, is extremely high (Bartlett 1963, Stern 1963). However, its effect on the immature stages is variable, because different species, depending on their larval habits and pupation sites, experience different degrees of exposure to insecticides. Host eggs do not protect Trichogramma semifumatum (Perkins) larvae from mortality caused by carbaryl applications (Stern 1963). Getzin (1960) observed that Derostenus variipes Crawford, a parasite of leafminers, was susceptible to certain insecticides in all developmental stages, while other species of parasites, which pupated in the soil, were afforded some protection.