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A survey of resistance to acaricides in economically important Ixodidae (Acari) of the major cattle-raising areas of Kenya

Published online by Cambridge University Press:  10 July 2009

P. L. Crampton  and
M. M. Gichanga
P. L. Crampton
Affiliation:
Wellcome Kenya Limited, Private Bag, P.O. Kabete, Kenya
M. M. Gichanga
Affiliation:
Wellcome Kenya Limited, Private Bag, P.O. Kabete, Kenya
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Abstract

The results are presented of a survey of the resistance to acaricides of strains of economically important ticks from the cattle-raising areas of Kenya in 1970–75. Larval progeny of ticks collected in the field were subjected to an immersion test to determine their resistance status to toxaphene and dioxathion. The proportions of samples of the three major species shown to be resistant to or tolerant of toxaphene were Boophilus decoloratus (Koch) 99·3%, Rhipicephalus evertsi evertsi Neum. 77·3% and R. appendiculatus Neum. 62·5 %. A large proportion of the relatively few samples of R. pulchellus (Gerst.) were also resistant to toxaphene, but few resistant samples of Amblyomma variegatum (F.) and Haemaphysalis leachii leachii (Aud.) were collected, and only one sample of Hyalomma (H. marginatum rufipes Koch) was tolerant of toxaphene. None of these species was resistant to dioxathion. Organophosphorus resistance was noted in one species only, R. sanguineus (Latr.), collected from the suburbs of Nairobi.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 69 , Issue 3 , September 1979 , pp. 427 - 439
Copyright
Copyright © Cambridge University Press 1979

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