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Comparative Toxicity of Orchard Insecticides to the Apple Blotch Leafminer, Phyllonorycter crataegella (Lepidoptera: Gracillariidae), and its Eulophid Parasitoid, Sympiesis marylandensis (Hymenoptera: Eulophidae)

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The toxicities of three orchard insecticides commonly used to control the apple blotch leafminer, Phyllonorycter crataegella (Clemens), were determined for this insect and for its eulophid parasitoid, Sympiesis marylandensis Girault, in an actively ventilated bioassay system. On the basis of LC50 values determined from insecticide residues on glass, only oxamyl was significantly more toxic to the moth than to the parasitoid. This enhanced selective toxicity to the moth was also apparent in a second bioassay system where the insects were exposed to oxamyl residues on apple leaf surfaces. Because exposure to insecticide residues on leaf surfaces more closely approximates the actual exposure situation in the field, these data support our contention that oxamyl may be the insecticide of choice in pest control strategies where leafminer control is necessary but where the grower also wishes to minimize insecticide selection against the beneficial parasitoid population.

Document Type: Research Article

Publication date: August 1, 1985

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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