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Susceptibility of two Cocoa Progenies to Attack by Insect Species

I—Proportion of Trees Infested

Published online by Cambridge University Press:  03 October 2008

M. Bigger
M. Bigger
Affiliation:
Cocoa Research Institute, P.O. Box 8, Tafo, Ghana
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Summary

Two cocoa progenies, T85/799×T17/359 and E1:C43/291×T63/967 (Series IIB hybrid), were compared for degree of infestation by 17 insect species comprising a Coccid, an Aphis, a Mirid and six ants. A significantly greater proportion of trees of the second variety was infested by the mealybugs Planococcus citri Risso and Pseudococcus hargreavesi Laing, by the Lecaniid scale Gascardia sp. nr. zonatus Newst., by the aphis Toxoptera aurantii Boys, by attendant ants Camponotus spp., and Crematogaster spp., and by the ant Polyrhachis laboriosa F. Smith. Because of differences in habitat requirement between the four Hemiptera, it is postulated that it is more likely that the response is due to a physiological difference between the two progenies than to a purely environmental difference.

Type
Research Article
Information
Experimental Agriculture , Volume 11 , Issue 3 , July 1975 , pp. 187 - 192
Copyright
Copyright © Cambridge University Press 1975

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References

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