Effect of Seed-Treatment Methods and Soil Water Content on Early Growth and Acephate Uptake by Corn and Cotton Plants

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A greenhouse study was conducted to evaluate methods of seed application of acephate and soil water content on acephate uptake and phytotoxicity for corn (Zea mays L.) and cotton( Gossypium hirsutum L.) seedlings. Seedling tissue levels of acephate and methamidophos, its insecticidal metabolite, were monitored at various plant-growth stages. Six levels of acephate seed treatments were used at low, medium, and high soil water contents in a replicated, randomized experiment. Treatments exhibited no phytotoxic effects, because acephate neither promoted nor inhibited emergence, nor did it significantly affect plant weight. However, plant acephate and methamidophos concentrations were significantly affected by acephate seed-treatment methods. Soil water treatments did not change plant emergence, but plant weight for a given growth stage increased as soil water content was increased. An inverse relationship existed between soil water content and plant acephate and methamidophos concentrations. All acephate seed treatments responded similarly. This result might be attributed to dilution of acephate in large plants grown under increased soil water contents. Plant acephate and methamidophos concentrations varied with growth stage in response to acephate dilution for a given water content. Differences in methamidophos concentration for a given tissue level of acephate indicated that cotton may be more effective than corn in metabolizing acephate. Potential soil and plant factors, which may have caused differences in acephate uptake, are discussed.

Document Type: Research Article

Publication date: August 1, 1984

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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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