Abstract
VARIOUS chlorinated hydrocarbon insecticides have been tested in large field trials in Ghana in recent years against the cocoa capsids Sahlbergella singularis Hagl. and Distantiella theobroma (Dist.). Great success has led to the widespread use of γ-BHC in routine control. One of the most persistent of these insecticides, ‘Dieldrin’, has also been used experimentally with great promise for controlling the principal vector of cocoa swollen shoot disease (the mealybug, Pseudococcus njalensis Laing) by decreasing the populations of its attendant ants1.
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References
Entwistle, P. F., Ann. Rep. West. Afr. Cacao Res. Inst., 31 (1957–8).
Johnson, C. G., and Entwistle, P. F., Ann. Rep. West. Afr. Cacao Res. Inst., 38 (1957–8).
Quart. Rep. West. Afr. Cacao Res. Inst., No. 47, 9 (1957).
Quart. Rep. West. Afr. Cacao Res. Inst., No. 51, 9 (1958).
Cunningham, R. K., and Lamb, J., J. Hort. Sci., 34, 14 (1959).
Johnson, C. G., in “Agriculture and Land Use in Ghana” (Oxford Univ. Press; in the press).
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ENTWISTLE, P., JOHNSON, C. & DUNN, E. New Pests of Cocoa (Theobroma cacao L.) in Ghana following Applications of Insecticides. Nature 184, 2040 (1959). https://doi.org/10.1038/1842040a0
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DOI: https://doi.org/10.1038/1842040a0
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