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Distribution and relative importance of lepidopteran cereal stemborers and their parasitoids in Uganda

  • Entomology
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Abstract

Infestation levels and parasitism of lepidopteran stemborers on maize were assessed in four agroecological zones (AEZ) in Uganda. The indigenous noctuidBusseola fusca Fuller (Noctuidae) and the invasiveChilo partellus Swinhoe (Crambidae) were the most important stemborers recorded.C. partellus represented 77% of the stemborers in the Eastern AEZ whileB. fusca was dominant in the other AEZs, accounting for 60–79%. The proportion of infested plants was between 16% and 45% and borer density between 0.2 and 1.0 borers per plant. There was no clear relationship between damage and stem tunneling, which is often used to estimate yield loss.Telenomus busseolae Gahan (Scelionidae), the only egg parasitoid recovered, caused parasitism of up to 46% onB. fusca eggs. Several larval and pupal parasitoid species were recorded. The most common were the indigenous braconidCotesia sesamiae and the introducedCotesia flavipes, which are larval parasitoids ofB. fusca andC. partellus, respectively. Mean parasitism by the indigenousC. sesamiae ranged between 2.0% and 29.4% onB. fusca and from 0 to 13% onC. partellus. C. flavipes was recovered at most locations with parasitism of 0–30.5% onC. partellus and 0–12% onB. fusca; the latter was probably the result of multiparasitism as laboratory studies have shown that it was not a suitable host forC. partellus. Results indicated further that the parasitoid has not attained equilibrium 5 years after its introduction.

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Authors and Affiliations

  1. International Centre of Insect Physiology and Ecology (ICIPE), Nairobi, Kenya

    T. Matama-Kauma, F. Schulthess & C. O. Omwega

  2. Namulonge Agricultural & Animal Research Institute (NAARI), Kampala, Uganda

    T. Matama-Kauma & J. A. Ogwang

  3. Kenyatta University, Nairobi, Kenya

    J. M. Mueke

Authors
  1. T. Matama-Kauma
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  2. F. Schulthess
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  3. J. A. Ogwang
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  4. J. M. Mueke
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  5. C. O. Omwega
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Correspondence to F. Schulthess.

Additional information

http://www.phytoparasitica.org posting Nov. 20, 2006.

Teddy Matama-Kauma died suddenly in an accident on Dec. 10, 2006, while this paper was in press.

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Matama-Kauma, T., Schulthess, F., Ogwang, J.A. et al. Distribution and relative importance of lepidopteran cereal stemborers and their parasitoids in Uganda. Phytoparasitica 35, 27–36 (2007). https://doi.org/10.1007/BF02981059

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  • DOI: https://doi.org/10.1007/BF02981059

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