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Multiple Insecticide Treatments Affect Harvest Residues of Lettuce

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Multiple treatments of mevinphos, methomyl, and permethrin were applied to head lettuce (Latuca sativa L.) under commercial field conditions, and harvest residues compared with those of single treatments made at identical periods before harvest. Single treatments resulted in harvest residue levels below current legal tolerances for these materials on head lettuce. Two consecutive treatments of all insecticides 8 d apart resulted in similarly low harvest residues. However, at shorter treatment intervals of 4 and 2 d, the same materials showed extensive residue accumulation. This trend was greatest at successive treatment intervals of 2 d, where mevinphos increased by 79%, methomyl by 161%, and permethrin by 242%. The importance of this residue loading phenomenon is discussed in light of management of insecticide residues on lettuce in commercial production.

Document Type: Research Article

Publication date: December 1, 1993

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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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