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Multiparasitism by the pupal parasitoids, Xanthopimplastemmator (Hymenoptera: Ichneumonidae) and Pediobiusfurvus (Hymenoptera: Eulophidae) on two African cereal stemborers, Chilopartellus (Lepidoptera: Crambidae) and Busseola fusca (Lepidoptera: Noctuidae)Published online 13 October 2005

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The outcome of multiparasitism by two pupal parasitoids, the exotic solitary ichneumonid Xanthopimpla stemmator and the indigenous gregarious eulophid Pediobius furvus, was studied using the invasive crambid stem borer Chilo partellus and the indigenous noctuid Busseola fusca as hosts. Two parasitism sequences were observed, where X. stemmator oviposited before P. furvus , and vice versa. In addition, the effect of time between first and second parasitism on parasitoid emergence, development, sex ratio, and number of offspring was assessed. For most treatments, time interval between parasitism had no significant effect on the percentage if pupae producing either P. furvus or X. stemmator . In general, X. stemmator outcompeted P. furvus irrespective of the order of oviposition, time interval between ovipositions and host species. Further studies, especially on host finding capacity of the two parasitoid species are required to determine the competitiveness of the two species under field conditions.
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Keywords: Busseola fusca; Chilo partellus; Pediobius furvus; Xanthopimpla stemmator; multiparasitism; pupal parasitoids

Document Type: Research Article

Affiliations: 1: Beneficial Insect Research Unit, ARS-USDA, Weslaco, TX, USA 2: Department of Zoology, Kenyatta University, P.O. Box 43844, Nairobi, Kenya 3: Stemborer Biological Control Program, International Centre of Insect Physiology and Ecology, Nairobi, Kenya

Publication date: 2006-01-01

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