Behavior of Heptachlor Epoxide in Soil1
Authors: HARRIS, C. R.; SANS, W. W.
Source: Journal of Economic Entomology, Volume 65, Number 2, April 1972 , pp. 336-341(6)
Publisher: Entomological Society of America
Abstract:A study, in both the laboratory and the field, was conducted to elucidate the factors influencing the behavior of heptachlor epoxide in soil. Laboratory studies were devoted to determining the factors influencing insecticidal activity. As a direct contact poison, the epoxide was as effective or more so than heptachlor against 24- to 48-hrold crickets, Gryllus pennsylvanicus (Burmeister); picture-winged flies, Chaetopsis debilis (Loew); and black cutworms, Agrotis ipsiloll (Hufnagel). However, in soil it was less effective than heptachlor. Tests indicated that in soil it vaporized to an extent sufficient to cause fumigant toxicity to insects and that volatility was dependent on soil type, moisture, and temperature. The major factor influencing insecticidal activity was soil type, with toxicity in moist soil negatively correlated with organic content. Moisture and temperature were factors of lesser importance. Tests on persistence of biological activity in mineral soil indicated that the epoxide was more persistent than heptachlor, but slightly less persistent than dieldrin. Micro plot field trials with 3 soil types containing 0.9, 16.6, and 51% organic matter treated with approximately 2 ppm of heptachlor epoxide indicated that while it was persistent in soil, insecticidal activity. absorption by crops, and mobility in soil were proportional to the organic content, rather than the concentration of insecticide.
Document Type: Research Article
Publication date: April 1972
- 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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