Location, acceptance and suitability of lepidopteran stemborers feeding on a cultivated and wild host-plant to the endoparasitoid Cotesia flavipes Cameron (Hymenoptera: Braconidae)

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,...

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Bibliographic Details
Published in:Biological control 2008-04, Vol.45 (1), p.36-47
Main Authors: Obonyo, Meshack, Schulthess, Fritz, Gerald, Juma, Wanyama, Onesmus, Rü, Bruno Le, Calatayud, Paul-André
Format: Article
Language:English
Subjects:
Animal biology
boring insects
Braconidae
Busseola fusca
Busseola phaia
Chilo partellus
Cotesia flavipes
food plants
GC analyses
herbivore-induced plant volatiles
host seeking
host-parasite relationships
Hymenoptera
Lepidoptera
Life Sciences
odors
olfactometry
parasitism
parasitoids
Pennisetum purpureum
Plant volatiles
Sciomesa piscator
Sesamia calamistis
Sesamia nonagrioides
Sorghum
Sorghum bicolor
volatile compounds
wild plants
Y-tube olfactometer
Zea mays
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Summary: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.
ISSN:1049-9644
1090-2112
DOI:10.1016/j.biocontrol.2007.11.010