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Studies on insecticide resistance in cotton stainers, Dysdercus spp. (Hemiptera: Pyrrhocoridae), in Kenya

Published online by Cambridge University Press:  10 July 2009

G. H. N. Nyamasyo  and
A. K. Karel
G. H. N. Nyamasyo
Affiliation:
Ministry of Agriculture, Kibos Research Station, Kenya
A. K. Karel
Affiliation:
Department of Entomology, University of Nairobi, P.O. Box 30197, Nairobi, Kenya
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Abstract

Resistance to carbaryl, lindane and methidathion was studied in field and laboratory strains of Dysdercus fasciatus Sign., D. nigrofasciatus Stål, D. superstitiosits (F.) and D. cardinalis Gerst. from Kenya. Four-day old fifth-instar female nymphs were found to be the most convenient for bioassay. The LC50s of carbaryl, lindane and methidathion for D. fasciatus were 372, 240, and 110 mg/litre, respectively, those for D. nigrofasciatus 337, 294, and 111 mg/litre, and that for carbaryl for D. cardinalis 147 mg/litre. The Meru and Ngwata strains of D. fasciatus had resistance factors of ×5·3 and ×6·1, respectively, to carbaryl. The field strains of all four species showed slight resistance (up to ×3·4) to lindane and methidathion. The poor control of Dysdercus spp. experienced in Eastern Province, Kenya, is probably due to the development of resistance to carbaryl. A laboratory and a field strain of each of D. fasciatus and D. nigrofasciatus were subjected to carbaryl selection pressure for six generations of doses equivalent to the LC50-LC70. The laboratory strain of D. fasciatus was also subjected to lindane selection for six generations. The laboratory and field strains of D. fasciatus developed resistance to carbaryl of ×3·7 and ×5·7, respectively, and cross-resistance to lindane of up to ×2·7. No significant increase in resistance was observed in D. nigrofasciatus after selection. The laboratory strain of D. fasciatus developed resistance to lindane of ×5·5 after selection and cross-resistance to carbaryl of ×4·3.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 72 , Issue 3 , September 1982 , pp. 461 - 465
Copyright
Copyright © Cambridge University Press 1982

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