Degradation and Biological Efficacy of Chlorpyrifos-Methyl on Wheat Stored at Five Temperatures and Three Moisture Contents

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Abstract:

Soft red winter wheat was treated with a calculated dosage of 6 ppm chlorpyrifos-methyl and stored at 15, 20, 25, 30, or 35°C and either 11.2, 12.1, or 13.7% moisture content (15 combinations). Measured residue deposition on the wheat was 4.39 ± 0.57 ppm, a 27.2% reduction from the calculated dosage. Residue degradation was asymptotic at all combinations except 15°C and 11.2 and 12.1% moisture content. Residue loss during the initial months of storage increased with increases in both temperature and moisture content within temperature. Rice weevils, Sitophilus oryzae (L.), did not survive bimonthly bioassays on wheat stored at either 15 or 20°C, but did survive on wheat stored at 20°C and 13.7% moisture content. Above 20° C, survival on treated wheat increased as residues decreased, and residues became either inactivated or diluted by increased moisture content. Numbers of F 1 progeny, the percentage of insect-damaged kernels, and the amount of ground wheat Rour (dockage) were positively correlated with weevil survival and negatively correlated with residue levels.

Document Type: Research Article

Publication date: October 1, 1992

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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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