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Effectiveness of Various Formulations of Five Insecticides on Insects Infesting Douglas-Fir Logs1,2

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Application of endrin, lindane, Thiodan® (6,7,8,9,10,10-hexachloro-1,5, .5a, 6, 9, 9a-hcx:lhydro-6, 9-methano-2, 4,3-benzodioxathicpin- 3-oxide), Sevin® (1-naphthyl methylcarbamate), and heptachlor in solution, suspension and emulsion to the bark of freshly cut Douglas-fir logs (Pseudotsuga menziesii (Mirb.) Franco) provided very good protection from infestation by the Douglas-fir beetle (Dendroctonus pseudotsugae Hopk.) and other bark and wood boring insects. Emulsions and solutions, however, were more effective than suspensions. Field bioassays and bark analyses of the treated logs 10 weeks after application indicated that much of the insecticides penetrated the bark, particularly in the solution and emulsion forms.

Wood fiber surfaces, treated with emulsions and suspensions of the five insecticides, were used for studying residual toxicity under constant laboratory conditions for a 7-week period. Wettable powders of Thiodan, endrin, and Sevin show gradual decline in residual toxicity, whereas a rapid decrease was shown by heptachlor and lindane. The emulsions exhibited a parallel but lower toxicity in all cases.

Document Type: Research Article

Publication date: October 1, 1960

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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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