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Contact toxicities of 22 insecticides to the cocoa Mirid Distantiella theobroma (Dist.) (Hemiptera, Miridae)*

Published online by Cambridge University Press:  10 July 2009

G. Prins
G. Prins
Affiliation:
Cocoa Research Institute, Ghana Academy of Sciences, New Tafo, Ghana
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Extract

In tests of insecticides applied in a spray tower to the ventral surface of nymphs of Distantiella theobroma (Dist.) collected from lindane-resistant and lindanesusceptible populations in cocoa plantations in Ghana, the levels of resistance of the former (ratios of the LC50's of the two populations) were 20·1, 74·4 and 73·3 for lindane, dieldrin and aldrin, respectively. There was no cross-resistance to DDT. Out of 18 other compounds tested, carbaryl (the most toxic), two other carbamates and two organophosphates were more toxic to the resistant population than was lindane to the susceptible one.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 56 , Issue 2 , December 1965 , pp. 231 - 235
Copyright
Copyright © Cambridge University Press 1965

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