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Fifty-five insecticides were tested for their toxicity to larvae of the Douglas-fir tussock moth, Hememcampa pseudotsugata McDunnough. The 10 most active insecticides in descending order of average toxicity at LD90 were: pyrethrins, Dursban® (O,O-diethyl O-3,5,6-trichloro- 2-pyridyl phosphorothioate), Zectran® (4-dimethylamino-3.5-xylyl methylcarbamate), dichlorvos, GC-6506 (dimethyl p-(methythio) phenyl phosphate), aminocarb, tetramethrin, allethrin, Bayer 37298 (O-ethyl 0-2,4,5-trichlorophenyl ethylphosphonothioate), and DDT. Four of the 10 insecticides-pyrethrins, Dursban, Zectran. And DDT-have been field-tested recently with varying results. Several insecticides were examined in the laboratory in more detail in different formulations for such characteristics as rate of toxic action and residual activity.
Document Type: Research Article
Publication date: April 1, 1970
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.