Location, acceptance and suitability of lepidopteran stemborers feeding on a cultivated and wild host-plant to the endoparasitoid Cotesia flavipes Cameron (Hymenoptera: Braconidae)
View/ Open
Date
2008-04Author
Calatayud, Paul-André
Rü, Bruno Le
Wanyama, Onesmus
Gerald, Juma
Schulthess, Fritz
Obonyo, Meshack
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
Maize fields in Africa are usually surrounded by land occupied by wild plants many of which harbor lepidopteran stemborer species not found on crops. It is not known if the exotic braconid parasitoid Cotesia flavipes, which was released in Kenya in 1993 against the invasive crambid Chilo partellus, searches for and attacks these borers in their natural habitats and whether they are suitable for parasitoid development. The objective of this study was to assess the relationship between acceptance and suitability of six stemborer species attacking cultivated sorghum (C. partellus, Busseola fusca, Sesamia calamistis, and S. nonagrioides) or Napier grass (Busseola phaia and Sciomesa piscator) to C. flavipes. Although all stemborer species were equally accepted for ovipositor probing by C. flavipes, only C. partellus and S. calamistis were suitable and produced parasitoids. In olfactometric bioassays, C. flavipes females were more attracted to stemborer-infested than uninfested plants. Analyses of the volatile compounds showed that they produced richer volatile profiles, mainly comprising C5–C6 alcohols, terpenoids, aromatic and aliphatic compounds, than uninfested plants. It can be concluded that stemborer species, that were accepted for oviposition but were unsuitable for parasitoid development, form a reproductive sink and that the exotic parasitoid would not establish in areas where these are the predominant species.
URI
http://www.sciencedirect.com/science/article/pii/S1049964407002940http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/47178
Citation
Biological Control Volume 45, Issue 1, April 2008, Pages 36–47Publisher
Department of Biochemistry
Subject
GC analysesY-tube olfactometer
Plant volatiles
Pennisetum purpureum
Sorghum bicolor
Sciomesa piscator
Busseola phaia
Busseola fusca
Chilo partellus
Sesamia calamistis
Sesamia nonagrioides
Collections
- Faculty of Health Sciences (FHS) [10378]