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Treatments of toxaphene-DDT and calcium arsenate were begun when cotton was at the cotyledonary stage of development and were terminated after 7,12, and 16 weekly applications. All insecticide treatments significantly reduced plant height, with suppression being greater in plots treated with calcium arsenate for 16 weeks during the growing season. A significantly greater number of bolls were produced in plots treated with toxaphene-DDT for 12 and 16 weeks; however, any advantage was offset by a concurrent reduction in bolt size and weight, and yield was not affected. Sixteen weekly applications of calcium arsenate resulted in a significant reduction in yield, seed weight, lint index, boll weight, dry weight of plants, and boll production. Other calcium arsenate treatments affected only the height of cotton plants. None of the insecticide treatments affected earliness, seeds per boll, per cent lint, per cent shed, and germination.
Document Type: Research Article
Publication date: April 1, 1961
More about this publication?
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.