Residues of Dieldrin and Heptachlor Epoxide Found in Pumpkins Growing on Soil Treated with Aldrin and Heptachlor1

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Canning pumpkins were grown on soil treated with aldrin and heptachlor. Soil surrounding the roots and vines and soil beneath the pumpkin fruit were analyzed at harvest. Some plants were manipulated so that either roots and vines or the fruit or the entire plant was situated in or on soils containing the insecticides.

Pumpkins grown in or on soils treated with aldrin or Heptachlor contained residues of the epoxides of these chemicals. where pumpkin vines and roots were grown in treated soil and fruits were supported above the soil, the residue in the whole pumpkin was 4.4% (heptachlor epoxide) and 7.6% (dieldrin) of amounts present in the soil. When the fruit only was exposed to the soil residue, the residue in the whole pumpkin was 5.3% (heptachlor epoxide) and 7% (dieldrin) of that found in the soil on which it was resting. when the entire plant was grown on treated soil, residues averaged 12.6% (heptachlor epoxide) and 8.2% (dieldrin) of the maximum amount found in the soil. Highest concentrations of chemical occurred in rind and seeds; pumpkin pulp contained only trace amounts of insecticide.

Document Type: Research Article

Publication date: June 1, 1967

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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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