Abstract
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.
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