Persistence and Biological Activity of Residues of Granular Insecticides in Organic Soil and Onions with Furrow Treatment for Control of the Onion Maggot (Diptera: Anthomyiidae)

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studies with the granular insecticides chlorfenvinphos, chlorpyri£os, isofenphos, and terbufos showed that when these are applied properly as in-furrow treatments for the control of the onion maggot in organic soil, good control is obtained of the first generation maggot and that damage caused by infestation by second- and third-generation larvae is significantly reduced. Survival of onion maggots from eggs to larvae was independent of whether the eggs were placed beside the plant or in the leafaxils of the plant. Fonofos, chlorpyri£os, and isofenphos were more persistent than isofenphos in organic soil and, with the exception of chlorpyrifos, all had declined to less than half the original level by the beginning of September. Significant residues of each of the four insecticides were detected in immature bulbs (64-76 d after seeding) with the level of residue being much higher in the roots and outer skin. Ninety-six days after seeding (2 mo before harvest), insecticide residues in bulbs were below the level of detection.

Document Type: Research Article

Publication date: August 1, 1991

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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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