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The Cotton Jassid, Empoasca lybica (De Berg.) during the dead Seasons in the Gezira, Anglo-Egyptian Sudan

Published online by Cambridge University Press:  10 July 2009

J. W. Cowland  and
A. D. Hanna
J. W. Cowland
Affiliation:
Senior Entomologists, Research Farm, Wad Medani.
A. D. Hanna
Affiliation:
Senior Entomologists, Research Farm, Wad Medani.
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Extract

Regular surveys were carried out from May to July to find out where Jassids live during the cotton close season.

A list of host plants on which Jassids can breed, or feed only as adults, is given; they exhibit preference for certain plants.

The movement of Jassids to cotton was recorded. The initial infestation of cotton is very small but is rapidly built up within the cotton crop. Gardens are shown to be the chief sources of infestation and cotton fields nearest them show larger initial numbers.

Attempts to exterminate Jassids in these gardens by spraying all plants with 0.1 per cent, or 0.5 per cent. DDT emulsion during the summer dead season were not successful. It is thought that reinfestation came from adults which had been present on the tops of Acacia arabica trees and had not been reached by the spray.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 41 , Issue 2 , September 1950 , pp. 355 - 358
Copyright
Copyright © Cambridge University Press 1950

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References

Cowland, J. W. & Edwards, C. J. (1949). Control of Empoasca lybica, de Berg., on Cotton in the Anglo-Egyptian Sudan.—Bull. ent. Res., 40, pp. 83–96, 1 pl., 3 figs.CrossRefGoogle Scholar