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Susceptibility of an Alfalfa Leaf cutting Bee1 to Residues of Insecticides on Foliage2,3

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Abstract:

Alfalfa leaf cutting bees, Megachile rotundata (F.), were exposed to leaves of alfalfa, Medicago SativaL. (used in nest building), that had been treated with carbaryl, DDT, and azinphosmethyl in filed and greenhouse cages. The treated alfalfa leaves were the only nest-building material, and fiddle-neck, Phacelia tanacetifolia Benth, was the only source of pollen and nectar. Only 1 of the 2 plant species was sprayed in each test.

Both adult females and larvae died when the alfalfa leaves were the only source of exposure to the insecticides. Larval mortality was at least as great when the contaminated alfalfa leaves were used to build cells as when the contaminated pollen and nectar were used to provision the cell. Adult mortality was greater when the insecticide was applied to the insecticide was applied to the fiddle-neck flowers than to the alfalfa leaves. Azinphosmethyl was hightly and DDT moderately toxic. Carbaryl was relatively nontoxic.

Document Type: Research Article

Publication date: February 1, 1969

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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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