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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 4, No. 3, 1996, pp. 325-337
Bioline Code: cs96072
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 4, No. 3, 1996, pp. 325-337

 fr
Giles, P.H.; Hill, M.G.; Nang'ayo, F.L.O.; Farrell, G. & Kibata, G.N.

Résumé

La premiere publication de l'agent biocontrol contre les
pestes des produits en stock dans l'Afrique de l'Est a ete
decrite.  Ce qui a implique la publication en 1992 de scarabee
(bestiole) (Tetriosoma migrescens  Lewis), un predateur
meso-americain de grains (Prostephanus truncatus 
(Horn).  Le predateur a ete libere dans deux centres au Kenya
dans des conditions climatiques contrastes: chaude, semi-aride
dans des conditions dans les plaines, et froide dans les
regions montagneuses.  Ce document donne une vision sur les
observations preliminaires pour etablir et distribuer le  T.
nigrescens  et son impact sur la peste.  les nombres des
Prostephanus truncatus etaient reduits pendant que le 
T. nigrescens etait present dans l'epis de mais pendant la
saison chaude, sur un terrain.  Semi-arid mais pas dans une
glaciere, les regions montagneuses humides.  Durant la periode
de huit mois sur un champ  semi-aride, le predateur semble
avoir  une dispersion a 16 km, plus notamment a travers une
terre des arbistes naturels.  Les plantes sont reservees aux
publications et etudes ulterieures sur l'etablissement et
l'impact du predateur sont a discuter.

Mots Clés
Controle biologique, produits agricoles en stock, le Kenya, percer les grains, Prostephanus truncatus, Teretriosoma, nigrescens

 
 en Release and Establishment of the Predator Teretriosoma nigrescens Lewis for the biological control of Prostephanus truncatus (Horn) in Kenya
Giles, P.H.; Hill, M.G.; Nang'ayo, F.L.O.; Farrell, G. & Kibata, G.N.

Abstract

The first release of a biocontrol agent against a stored 
product pest in East Africa is described. This involved the
release in 1992 of a beetle (Teretriosoma nigrescens 
Lewis), a  meso-American predator of the Larger Grain
Borer (Prostephanus truncatus (Horn)). The predator 
was liberated at two sites in Kenya with contrasting
climatic conditions:  hot, semi-arid plains, and cool, damp
highlands. This paper discusses preliminary observations on 
the establishment and dispersal of T. nigrescens and its
impact on the pest. Prostephanus truncatus numbers 
were reduced  when  T. nigrescens  was  present in stored
maize cobs in the hot, semi-arid area but not in the 
cooler, damper highlands. During a period of eight months in
the semi-arid site, the predator was shown to have 
dispersed 16 km,  mainly downwind through natural shrub 
land.  Plans for further releases and studies on the
establishment and impact of the predator are discussed.

Keywords
Biological control, farm storage, Kenya, Larger Grain Borer, Prostephanus truncatus, Teretriosoma, nigrescens

 
© Copyright 1996 - African Crop Science Society

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