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Factors Affecting the Tolerance of Boll Weevils to Calcium Arsenates1

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Boll weevils (Anthonomus grandis Boh.) emerged from cotton bolls were more tolerant to tircalcium arsenate than n those emerged from squares. Their wet weight and fat content were also greater. When field-collected weevils were exposed to calcium arsenate in petri dishes with or without cotton squares for food, the insects that died first had lower body weight and fat content than those that died later. Tricaleium arsenate and commercial calcium arsenate were found to kill weevils when ingestion of the poisons was made impossible, but their effectiveness was reduced by one-half. Weevils treated with calcium arsenates lost weight more rapidly under desiccation than untreated live or dead weevils. The mortality of treated insects decreased as the humidity increased, but that of untreated insects showed little difference. These results indicate that under field conditions, when the evaporation rate is higher than that in the laboratory, the desiccating action of calcium arsenates may be responsible for partial control of the insects.

Document Type: Research Article

Publication date: October 1, 1960

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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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