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Factors Influencing the Persistence and Effectiveness of Chlorpyrifos in Soil

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Chemical dissipation rates and insecticidal effectiveness against the cabbage maggot, Delia radicum (L.), were determined for row-band applications of chlorpyrifos at planting with two formulations, two methods of application, and three dilutions of water-based spray drenches in field tests on Sultan silt loam. Zero-day residues ranged from 85 to 97% of the amount applied. Time for 50% loss of insecticide ranged from 3 to 56 days. Insecticide applied in granular formulation dissipated slower than insecticide formulated as water-based spray emulsions, and soil-incorporated treatments always dissipated slower than unincorporated soil-surface treatments. Chlorpyrifos residues of water-based sprays that weathered under high mean temperatures disappeared considerably faster than residues that weathered under lower mean temperatures. Incorporated chlorpyrifos gave better cabbage maggot control than surface deposits. There was little difference in the degree of maggot damage between spring and summer tests even though residues of summer applications declined faster than those of spring applications. Increasing the water volume for soil-surface spray drenches from 3.5 to 33.2 liters of finished spray per 300 m of row increased chemical persistence and effectiveness, but only slightly.

Document Type: Research Article

Publication date: April 1, 1985

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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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