Dipyridyls are isomeric pyridine derivatives which bear certain resemblances to nicotine in chemical structure, physical properties and toxicity to insects. Crude dipyridyl oil, a mixture of several isomeric dipyridyls and impurities, was found to be highly toxic to 6 species of aphids when applied in spray form. In submergence tests with several species of coleopterous and lepidopterous insects, it also proved to be toxic. To the aphids it was not as toxic as nicotine, but to several of the larger insects it was more toxic. The toxicity of several of the isomers from the crude dipyridyl oil was ascertained; one of these appears to have marked toxicity. Concentrations of crude dipyridyl which are sufficient to kill aphids arc apparently harmless to certain of the plants they attack.
Document Type: Research Article
Publication date: April 1, 1925
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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.