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Laboratory Studies on the Relative Contact and Residual Toxicity of Ten Test Insecticides to Dendroctonus pseudotsugae Hopk.1

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The spray-tunnel application method was adapted for fast determining of the contact toxicity of insecticides to bark beetles. The Douglas-fir beetle (Dendroctonus pseudotsugae Hopk.) was used as the test insect. The relative contact toxicity of 10 test insecticides at the LD50 and LD90 levels, listed in decreasing order, was as follows:

at LD50: Lindane>Thiodan®(6,7,S,9,10,10-hexachlor-1,5,5a, 6,9, 9a-hcxahydro-6, 9-methano-2, 4, 3- benzodioxathiepin-3- oxide)> isodrin> endrin>Sevin®(N-methyl-1-naphthyl carbamate) > heptllchlor> aldrin and dieldrin> DDT >chlordane;

at LD90: Thiodan> endrin > lindane> isodrin> Sevin> aldrin > heptachlor> dieldrin> DDT> chlordane.

All insecticides showed greater toxicity to the males than to the females except Sevin, which was more toxic to females.

Treated wood fiber surfaces were used for studying the residual toxicity under constant laboratory conditions for a 13-week period. In contrast to the gradual decline in residual toxicity of endrin, Thiodan, and to a lesser degree isodrin, a rapid decrease was shown by lindane, aldrin, heptachlor, and chlordane. DDT exhibited the most gradual decline.

Document Type: Research Article

Publication date: June 1, 1959

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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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