Abstract
Empoasca lybica de Berg., a pest of cotton in the Sudan Gezira Scheme, invades the seedling crop early in September, the infestation normally reaching its maximum intensity in the last half of November. Hanna1 records that peak populations of this insect are affected by rainstorms of 10 mm. and more in July and August as well as by dust storms in September. Field observations by Cowland and Hanna2 suggest that populations upon cotton are also affected by rainstorms in September. Rainstorms, probably because of the mud which splashes on to the lower leaves, reduce the number of jassids infesting the cotton. Those findings which concerned the direct effect of rainstorms upon jassids at nine sites in the northern part of the Sudan Gezira were not reported by Hanna1 in his published paper on rainfall and jassid numbers.
Similar content being viewed by others
Article PDF
References
Hanna, D., Bull. Ent. Res., 41 (2), 339 (1950).
Cowland, J. W., and Hanna, A. D., Ann. Rep. Res. Div. Min. Agric. Sudan Govt., 1948/49, p. 106 (1951).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
GOODMAN, A., TOMS, A. Effect of Rainstorms upon the Cotton Jassid in the Sudan Gezira. Nature 178, 436 (1956). https://doi.org/10.1038/178436a0
Issue Date:
DOI: https://doi.org/10.1038/178436a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.