Populations of Certain Insects and Spiders on Cotton Plants Following Insecticide Applications

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Abstract
In 1959, 1960, and 1961 sweep-net collections were made in several field-plot experiments on cotton in the vicinity of Stoneville, Mississippi. The numbers of several species of insects and spiders were recorded following applications of various insecticides and insecticide mixtures. Early-season applications for thrips control had little effect on the insect populations studied several weeks later during the fruiting period. Applications made during the fruiting period of the cotton plant resulted in population reductions of many of the insect species and spiders studied. The species affected and the amount of reduction were quite variable, depending on the insecticide or mixture used, dosage, number of applications, and timing of applications. Insecticide mixtures containing DDT were in general more toxic to most species than any single insecticide.

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