Long-Term Persistence of Selected Insecticides in Subtropical Soil: Their Absorption by Crop Plants
Authors: Talekar, N. S.; Chen, J. S.; Kao, H. T.
Source: Journal of Economic Entomology, Volume 76, Number 2, April 1983 , pp. 207-214(8)
Publisher: Entomological Society of America
Abstract:A study was conducted to investigate the persistence of selected insecticides after seasonal (spring and fall) applications to silt loam soil over a 4-year period. DDT and dieldrin were applied at 5 kg (AI)/ha; fonofos, phorate, and carbofuran were applied. at 10 kg (AI)/ha. Insecticide residues were monitored in the top 15 em of soil each spring and fall before application. Insecticide residues accumulated after fall applications but degraded rapidly after spring applications. Except for dieldrin, no insecticide accumulated from 1 year to the next. After the first 2 years, total dieldrin residues increased with each application. After 5 years, the recoveries of DDT and dieldrin were 6.6 and 15% of the amount applied, respectively. Fonofos, phorate, and carbofuran residues represented less than 0.2% of compounds applied after 5 years. Insecticide degradation was faster during the hot and rainy months (May to October) than during cool and dry months (November to April). Cultivated soil retained more insecticide than fallow soil. Insecticide residues were absorbed in varying concentrations by sweet potato roots and white potato tubers grown in contaminated soil. Higher insecticide concentrations generally resulted in greater residue uptake by these plant parts.
Document Type: Research Article
Publication date: April 1, 1983
- 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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