Relationships of Insect Control Attempts by Chemicals to Components of Yield of Cowpeas in Uganda1

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Maruca testulalis Geyer (Lepidoptera: Pyralidae) is the most serious pest of cowpea in Uganda. Dry seed yield improvement associated with M. testulalis control by chemical insecticides is due not to increased pod production but rather to increased number of undamaged seeds per pod. Sprays of DDT tended to decrease the number of cowpea flowers produced and to shorten the duration of flowering; these factors had no detrimental effect on yield. Cowpea pod length tended to increase as numbers of thrips, Taeniothrips sjostedti (Trybom) and Sericothrips occiptalis Hood, decreased. Sprays of lindaue resulted in increased pod length whether in the presence or absence of high thrips levels.

Document Type: Research Article

Publication date: October 1, 1972

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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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