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Cereal Stemborer Species Complex and Establishment of Cotesia flavipes Cameron in Eastern Uganda

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Abstract

Studies were conducted in two districts of eastern Uganda from 1997 to 1999 to introduce and monitor the establishment of an exotic parasitoid, Cotesia flavipes Cameron (Hymenoptera: Braconidae), for the control of the stemborer Chilo Partellus (Swinhoe) (Lepidoptera: Pyralidae), and also to determine the stemborer species complex in maize and sorghum. The study confirmed the presence of four important stemborers, two pyralids Ch. partellus and Eldana saccharina Walker and two noctuids, Busseola fusca Fuller and Sesamia calamistis Hampson. Chilo Partellus was dominant, constituting 53-88% of stemborers fourd followed by B. fusca at 8–37 %. The most abundant local parasitoid was the larval parasitoid Cotesia sesamiae (Cameron) (Hymenoptera: Braconidae). The pupal parasitoids Pediobius furvus Gahan (Hymenoptera: Eulophidae) and Dentichasmias busseolae Heinrich (Hymenoptera: Ichneumonidae) were also recorded. Parasitism of Co. sesamiae on Ch. partellus ranged between 0 and 13.1 %. The introduced Co. flavipes was recovered from all sites in four consecutive seasons (between 1998 and 1999) causing parasitism of between 4 and 32.9 % on Ch. partellus. Cotesia flavipes was also recovered from the indigenous stemborers B. fusca and S. calamistis. This study indicates that Co. flavipes has established in eastern Uganda.

Résumé

Des études ont été menées dans deux départements en Ouganda entre 1997 et 1999 infin d’introduire et de suivre l’aclimatation d’un parasitoïde exotique, Cotesia flavipes Cameron (Hymenoptera: Braconidae), dans le cadre de la lutte contre le foreur, Chilo Partellus (Swinhoe) (Lepidoptera: Pyralidae), et de determiner le complexe d’espèces de foreurs sur maïs et sorgho dans cette région. Cette étude a confirmé la présence de 4 espèces importantes de foreurs; deux pyrales, Ch. partellus et Eldana saccharina Walker et deux noctuidés Busseola fusca Fuller et Sesamia calamistis Hampson. Chilo Partellus était l’espèce dominante formant près de 53-88% des borers collectés, suivit par B. fusca à 8–37 %. Le parasitoïde local le plus abundant a été le parasitoïde larvaire Cotesia sesamiae (Cameron) (Hymenoptera: Braconidae). Les parasitoïdes des pupes Pediobins furvus Gahan (Hymenoptera: Eulophidae) et Dentichasmias busseolae Heinrich (Hymenoptera: Ichneumonidae) ont aussi été trouvés. Le parasitisme par Co. sesamiae sur Ch. partellus a varié entre 0 et 13.1%. Le parasitoïde introduit Co. flavipes a été collecté sur tous les sites pendant quatres saisons consécutives (entre 1998 et 1999) avec un taux de parasitisme entre 4 et 32.9 % sur Ch. partellus. Cotesia flavipes a aussi été collecté sur des foreurs locaux, B. fusca et S. calamistis. Cette étude a montré que Co. flavipes s’est acclimaté dans l’est de l’Ouganda.

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Authors and Affiliations

  1. Department of Crop Science, Makerere University, P. O. Box 7062, Kampala, Uganda

    T. Matama-Kauma & S. Kyamanywa

  2. Namulonge Agricultural and Animal Production Research Institute, P. O. Box 7084, Kampala, Uganda

    J. A. Ogwang

  3. International Centre of Insect Physiology and Ecology, P. O. Box 30772, Nairobi, Kenya

    C. O. Omwega

  4. Ohio State University, Columbus, OH, 43210, USA

    H. R. Willson

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  1. T. Matama-Kauma
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  2. S. Kyamanywa
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  3. J. A. Ogwang
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  4. C. O. Omwega
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  5. H. R. Willson
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Correspondence to T. Matama-Kauma.

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Matama-Kauma, T., Kyamanywa, S., Ogwang, J.A. et al. Cereal Stemborer Species Complex and Establishment of Cotesia flavipes Cameron in Eastern Uganda. Int J Trop Insect Sci 21, 317–325 (2001). https://doi.org/10.1017/S1742758400008419

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