Cucumbers were grown in 1962 and 1963 on Carrington silt loam soils which contained various amounts of aldrin or heptachlor residues. The experiment provided that some of the developing cucumber fruits were lying on the ground while others developed without touching the soil. Similar insecticidal residue concentrations were found in all these cucumbers, as well as in the lower halves as compared with the upper halves of fruits lying on the ground. Insecticidal residues apparently penetrated through the root system and were then translocated into the cucumber fruits. Third cuttings of fresh alfalfa, grown in 1964 on aldrinor heptachlor-treated soils, were analyzed by gas-liquid chromatography and bioassay procedures. No mortalities were obtained with vinegar flies, Drosophila melanogaster Meigen, during a 48-hr exposure period to purified extracts of alfalfa from soils that contained 0.2–0.7 lb/6-in. acre of aldrin and dieldrin or heptachlor and heptachlorepoxide (2,3 epoxy-1,4,5,6,7,8,8-heptachloro-3a,4,7,7a-tetrahydro- 4,7-methanoindene) residues. Extracts of 70–100 g of alfalfa grown on soils of higher insecticidal residue concentrations were toxic to the insects and also contained measurable amounts of these chemicals. Residue concentrations in or on alfalfa grown on aldrin-treated soils were 0.88% ± 0.23 of their concentrations in the soil at harvest time, and 3.01% ± 0.85 for alfalfa grown on heptachlor-treated soils.
Document Type: Research Article
Publication date: August 1, 1965
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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.