Chilo partellus check for this species in other resources , Cotesia flavipes check for this species in other resources , Cotesia sesamiae check for this species in other resources , refuge, trap crop"/>
 
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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 10, No. 2, 2002, pp. 183-194
Bioline Code: cs02018
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 10, No. 2, 2002, pp. 183-194

 en Regional Distribution Of Lepidopteran Stemborers And Their Parasitoids Among Wild Grasses In The Semi-Arid Eastern Kenya
Songa, J.M.; Overholt, W.A.; Mueke, J.M. & Okello, R.O.

Abstract

A survey was conducted in six agroecological zones (AEZs) in semi-arid eastern Kenya, in May, 1996, to identify the major wild host grasses (abundance ≥ 70%) for stemborers in each zone. The grasses sampled were Pennisetum purpureum check for this species in other resources Schumach, P. trachyphyllum Pilg., Panicum maximum check for this species in other resources Jacq, Sorghum versicolor check for this species in other resources Anderss, Cenchrus ciliaris check for this species in other resources L. and Cyperus check for this species in other resources sp. Among these grasses, P. purpureumwas the most widespread and abundant. The survey was followed by an on-farm study conducted in each of the six AEZs to determine the relative abundance and distribution of stemborers, that infested the major wild grasses and their parasitoids . This was done by destructive sampling of 100 tillers, at a three-month interval, from July 1997 to April 1998. The stemborers that infested the grasses were Chilo partellus check for this species in other resources Swinhoe and Sesamia calamistis check for this species in other resources Hampson. Among these, C. partelluswas the predominant species, with the highest number being recovered on S. versicolor (94.6%). Parasitoids were only reared on S. versicolor, and these were Cotesia sesamiae check for this species in other resources (Cameron), C. flavipes Cameron, Chelonus curvimaculatus check for this species in other resources (Cameron), Pristomerus check for this species in other resources sp. and Norbanus check for this species in other resources sp., with C. flavipes causing the highest parasitism (13.6%). Results reveal that S. versicolor exhibited potential for use in the management of stemborers in maize, by acting as a "trap" and "refuge" crop for C. flavipes, between cropping seasons.

Keywords
Agroecological zones, Chilo partellus check for this species in other resources , Cotesia flavipes check for this species in other resources , Cotesia sesamiae check for this species in other resources , refuge, trap crop

 
 fr
Songa, J.M.; Overholt, W.A.; Mueke, J.M. & Okello, R.O.

Résumé

Une reconnaissance a été éffectuée dans six zones agro-écologiques de la région semi-aride du Kenya, en Mai 1996, en vue d'identifier les herbes sauvages dominantes (abundances > 70%) pouvant servir de pièges pour les destructeurs des tiges de maïs. Les herbes échantillonnées étaient Pennisetum purpureum check for this species in other resources Schumach, P. Tranchyphyllum Pilg., Panicum maximum check for this species in other resources Jacq, Sorghum versicolor check for this species in other resources Anderss, Cenchrus ciliaris check for this species in other resources L. and Cyperus check for this species in other resources sp. La reconnaissance était appuyée par une étude dans les fermes, dans chaque zone écologique, pour déterminer l'abondance relative et la distribution des destructeurs des tiges et leurs parasites envahissant les herbes dominantes. Pour ce faire, un échantillonnage destructif était utilisé. Cent tiges fraîches étaient coupées à trois mois d'interval, de Juillet 1997 en Avril 1998. Les destructeurs des tiges ayant attaqué les plantes étaient Chilo partellus check for this species in other resources Swinhoe et Sesamia calamistis check for this species in other resources Hampson. Partellus était l'espèce la plus dominante. Partellus était abondant sur le S. versicolor. Les parasites se cabraient uniquement sur S. versicolor, parmis eux, Cotesia sesamiae check for this species in other resources (Cameron), C. flavipes Cameron , Chalonus curvinaculatus (Cameron), Pristomerus check for this species in other resources sp. et Norbanus check for this species in other resources . Flavipes C. avait le plus taux de parasitisme (13.6%). Les résultats ont ainsi révélé que S. versicolor a un potentiel de control sur les destructeurs de mais en agissant comme piège et refuge au C. flavipes durant les saisons de culture.

Mots Clés
Zones agro-écologiques, Chilo partellus check for this species in other resources , Cotesia flavipes check for this species in other resources , Cotesia sesamiae check for this species in other resources , refuge, plant piège

 
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