NEW COTTON VARIETIES FOR IPM
Mar 13, 2017

Breeding & Genetic improvement WCRC Breeding-MedMiddleEast WCRC1
Abstract                                                                         Back to Table of contents

The major insect pests attacking cotton in the Sudan are the American bollworm, Helicoverpa armigera (HB), jassids, Jacobiasca lybica (De Berg), whitefly, Bemisia tabaci (Genn.) and aphids, Aphis gossypii (Glover).

Chemical control is widely used with the number of sprayings ranging between 4‑6. The cost of protection more than quadrupled during the last two seasons amounting to 40% of the total cost of production. The implementation of an alternative crop protection strategy capable of reducing the number of sprays had been seriously considered.

The alternative strategy hinged on delaying the sprays against the early season pests to encourage the build‑up of the natural enemies against the late season pests. The incorporation of the characters okra leaf and glabrousness offered host resistance against the whitefly while hairiness protected the crop against the early season pest, jassids, allowing the build‑up of the natural enemies against the late season pests. The release of two new varieties Acala (82) 8A and Acala (82) 8B varying in hair density is reported and data pertaining to pest load, yield and quality are discussed.

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