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Toxicity of TDE to Different Instars and Strains of the R~d-Banded Leaf Roller and the Response of a TDER-esistant Strain to Parathion and Endrin1

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The decline ill control of the red-banded leaf roller, Argyrotaenia velutinana (Walker), with TDE over the past few years indicates the development of resistance to this insecticide in certain populations of leaf rollers. The possibility of such resistance in a Virginia strain was verified in the present study when fifth-instar larvae of a Virginia strain were found to be 28.4 times more resistant to TDE than fifth-instar larvae of a Canadian susceptible strain. The toxicity studies consisted of confining the larvae under a treated glass or plastic cup inverted on treated apple, and apple foliage. First-, second- and fifth-instar larvae of the TDE-resistant strain were investigated as to their response to TDE, It was found that LC50 second-instar larvae were 185.1 times more resistant to TDE than first-instar. The results showed also that second- and fifth-instar larvae had comparatively the same response to TDE at LC50

The toxicity of parathion and endrin to second-instar larvae of the TDE-resistant strain was investigated. It was concluded that parathion resistance is probably present, and that the TDE resistant strain is susceptible to endrin.

Document Type: Research Article

Publication date: February 1, 1961

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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