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Comparative Toxicities of Some Insecticides to the Apple Maggot

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Abstract:

LD50 levels in ng/fly were established for dimethoate, azinphosmethyl, phosmet, and phosalone by topical application of insecticides to the dorsum of the thorax of laboratory-reared adult Rhagoletis pomonella (Walsh). The LD60 for females treated with dimethoate was 2.4 ng, 11.2 ng for phosmet, 12.1 ng for azinphosmethyl, and 25.9 ng for phosalone. Males were more susceptible than females.

Twenty other candidate pesticides were tested but none was as toxic as dimethoate. Eleven were about as toxic as azinphosmethyl. Diazinon and methyl parathion were the most toxic of these.

Field collected flies and strains from Vermont and Quebec were not significantly different in susceptibility than laboratory reared flies. On a dry weight basis, the blueberry maggot R. mendax Curran and the apple maggot were almost identically susceptible to dimethoate.

Document Type: Research Article

Publication date: August 1, 1974

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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