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Control of Empoasca lybica, de Berg., On Cotton in the Anglo-Egyptian Sudan

Published online by Cambridge University Press:  10 July 2009

J. W. Cowland  and
C. J. Edwards
J. W. Cowland
Affiliation:
Senior Entomologist, Research Division, Department of Agriculture and Forests, Sudan
C. J. Edwards
Affiliation:
Harston, Cambridge
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Extract

A short account of the life-cycle and symptoms of damage of the cotton Jassid, Empoasca lybica, de Berg., is given. In the initial cage experiments it is shown that DDT emulsion was superior to the copper compounds used. Experiments on the residual toxicity of DDT and “Gammexane” sprays are described. Tests with DDT emulsion showed that very young cotton is injured by emulsion containing as little as 0·025 per cent. DDT, but that emulsions containing up to 0·5 per cent. DDT can be used with safety on plants which are two months old. A coarse DDT suspension caused severe leaf distortion, but a fine suspension used later was quite safe at the concentration used.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 40 , Issue 1 , June 1949 , pp. 83 - 96
Copyright
Copyright © Cambridge University Press 1949

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References

Cowland, J. W. (1947). The Cotton Jassid (Empoasca libyca, Berg.) in the Anglo-Egyptian Sudan and experiments on its control.—Bull. ent. Res., 38, pp. 99–115.CrossRefGoogle Scholar