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Some Factors Influencing the Toxicity of Soil Applications of Chlorpyrifos and Diazinon to European Chafer Grubs

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Abstract:

Chlorpyrifos- and diazinon-treated soils of 8% moisture were more toxic to 3rd-instar grubs of Amphimallon majalis (Razoumowsky) than were treated soils containing 13 or 18% water. Differences in soil moisture did not affect degradation rates of chlorpyrifos, but formulation did. Halflives of ca. 7, 9, and 16 days were obtained with 22.4 EC, 0.95 G, and 0.88 G formulations, respectively. However, degradation of diazinon (5 G formulation) was more rapid as soil moisture increased, with half-lives of ca. 12 and 6 days for 8 and 13–18% moisture, respectively. Soil moisture did not affect diazinon uptake by grubs, but did affect chlorpyrifos uptake during a 22-h contact with treated soil. Total body residues were 1.0–1.5 ppm for grubs in diazinon-treated soil at all moisture levels, whereas higher chlorpyrifos residues (3.2 ppm) were found in grubs from soil with 8% moisture than from soil with 13–18% moisture (1.8 ppm).

Document Type: Research Article

Publication date: December 1, 1978

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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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