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Biological control of the larger grain borer Prostephanus truncatus (Coleoptera: Bostrichidae) in Kenya using a predatory beetle Teretrius nigrescens(Coleoptera: Histeridae)

Published online by Cambridge University Press:  09 March 2007

M.G. Hill*
Affiliation:
CABI Bioscience, Silwood Park, Buckhurst Road, Ascot, Berkshire, SL5 7TA, UK
F.L.O. Nang'ayo
Affiliation:
Kenya Agricultural Research Institute, National Agricultural Research Centre, Muguga, PO Box 30148, Nairobi, Kenya
D.J. Wright
Affiliation:
Department of Biological Sciences, Imperial College of Science, Technology and Medicine, Silwood Park, Ascot, Berkshire, SL5 7PY, UK
*
*current address: Hort Research, No. 1 Road, RD2, Te Puke, New Zealand Fax: ++ 64 7 573 3871 E-mail: [email protected]

Abstract

The establishment of the predatory histerid beetle, Teretrius nigrescens Lewis, following its field release in south eastern Kenya in 1992, and its impact on populations of the larger grain borer, Prostephanus truncatus (Horn), in woodland habitats is evaluated. Pheromone trap catch data show a single strong peak of P. truncatus from November to January, coincident with the short rains. Comparisons of P. truncatus pheromone trap catches before and after predator establishment, and in areas with and without T. nigrescens, show a sustained decline of over 80% in P. truncatus abundance over a 5-year period, following the establishment T. nigrescens. Concurrent laboratory studies of the impact of T. nigrescens on populations of P. truncatus raised on a wood substrate showed a 77% reduction in the growth of the pest population. These results are compared with published findings of the impact of T. nigrescens as a biological control agent of P. truncatus in west Africa.

Type
Review Article
Copyright
Copyright © Cambridge University Press 2003

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