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Effects of the Number of Sprayings and Different Chemicals in Controlling Cotton Pests in the Sudan

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In the aerial cotton spraying experiments carried out in the 1963-64, 1964-65, and 1965-66 seasons in the Sudan the efficiency of different insecticides in controlling the American boll worm, Helicoverpa amigera (Hübner); a jassid, Empoasca lybica (= libyca) (de Bergevin & Zenon); and the sweet potato whitefly, Bemisia tabaci (Gennadius), were investigated. At the same time the yield response to different numbers of sprays was observed.

The results obtained from these experiments indicate dearly that insects pests can affect greatly the cotton yield. If the colton is protected properly against the American boll worm, jassids, and whiteflics the yield may be increased from 1.27 to 2.10 kantars/feddan (kantar/ feddan=300 lb/acre). The best results in controlling all these 3 pests on cotton were obtained when the crop was sprayed with mixture of DDT + dimethoate. It was found that endrin and toxaphene-DDT-methylparathion also can control this pest complex, but not so efficiently as DDT + dimethoate. Fortnightly spraying intervals with efficient insecticides can protect the crop against these 3 insect pests. The number of sprayings which will be applied in I season should be decided according to the pest situation in the field.

Document Type: Research Article

Publication date: April 1, 1970

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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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