Linking Insecticide Bioassays with Residue Analyses To Evaluate Control of Platynota idaeusalis (Lepidoptera: Tortricidae) Neonates on Apple: Single Spray

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Evaluation of the insecticides azinphos-methyl, chlorpyrifos, methomyl, and microencapsulated methyl parathion for control of Platynota idaeusalis (Walker) for 15 d after a single air-blast spray application to one side of apple trees was conducted with residue analyses and leaf-disk bioassays of laboratory-reared and field-collected neonates. Only 3-9% of the insecticide residues were initially deposited on the unsprayed side compared with the sprayed side. A laboratory-reared strain of P. idaeusalis was more susceptible than a field-collected strain to each insecticide. Methomyl and chlorpyrifos initially had high toxicity to neonates but residues persisted over a short time interval. Azinphos-methyl and microencapsulated methyl parathion had much longer persistence than these two compounds; however, azinphos-methyl provided poor control of fieldcollected larvae. Residues of microencapsulated methyl parathion on the sprayed side of the tree caused >50% mortality of field-collected neonates after 10 d.

Document Type: Research Article

Publication date: June 1, 1992

More about this publication?
  • 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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