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The Effects of DDT and Sublethal Doses of Dicofol on Reproduction of the Two-Spotted Spider Mite1

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Results of direct treatment of two-spotted spider mites, Tetranychus urticae (Koch) (=T. telarius (L.)) ,are contrasted with treatment of plants on which mites may grow and reproduce. Residual treatments of DDT or dicofol applied sublethally, but directly, to two-spotted spider mites, did not affect fecundity. The F1 generation of female mites matured more rapidly when grown on the trifoliate leaves of a bean plant treated with DDT on the primary leaves.

Mite reproduction was greatest at a moderately high nitrogen concentration in the leaves. Mite reproduction increased on excised bean leaves floated on solutions of sucrose or calcium nitrate. Mite reproduction decreased on leaves exposed to glucose solutions. A 20% increase occurred with a combination of all 3 nutrients.

Document Type: Research Article

Publication date: April 1, 1966

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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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