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Author (up) Babu, A.; Hern, A.; Dorn, S. url  doi
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  Title Sources of semiochemicals mediating host finding in Callosobruchus chinensis (Coleoptera: Bruchidae) Type Journal Article
  Year 2003 Publication Bulletin of Entomological Research Abbreviated Journal Bull Entomol Res  
  Volume 93 Issue 3 Pages 187-192  
  Keywords Animals; Beetles/drug effects/*physiology; Biological Assay; Fabaceae/chemistry/*parasitology; Female; Gas Chromatography-Mass Spectrometry; Host-Parasite Interactions/drug effects; Insect Repellents/analysis/pharmacology; Male; Pest Control, Biological/*methods; Pheromones/analysis/pharmacology; Plant Extracts/*analysis/pharmacology; Seeds/chemistry/*parasitology; Volatilization  
  Abstract Bruchid pests such as Callosobruchus chinensis (Linnaeus) endanger stored legume seeds throughout the tropical belt. The chemical composition of the headspace volatiles from healthy and fourth instar larvae-infested cowpea seeds were identified, characterized, and compared using gas chromatography-mass spectrometry. Y-tube olfactometer bioassays were performed to evaluate the effect of these chemicals on the orientation of conspecific adult females. Analysis of volatiles released from healthy and infested seeds revealed qualitative differences for three out of the 17 compounds identified. Dimethyl disulphide, isobutenyl methyl ketone and methyl trisulphide were found only in the blend emitted from infested but not from healthy seeds. Quantitative differences were apparent for tridecane which was released in larger amounts from infested seeds. While volatiles collected from healthy seeds were attractive to female bruchids, volatiles collected from infested seeds were repellent. To test the hypothesis that the qualitative differences in the chemical composition found may be due to insect-derived components, the volatiles from frass and fourth instar larvae combined were analysed. These volatiles contained both of the sulphides emitted from infested seed but not from healthy seeds. Although a limited induction of volatiles from cowpea seeds cannot be excluded, it is postulated that behavioural differences of the female weevils are largely due to insect-derived semiochemicals. The potential use of such semiochemicals as part of an integrated pest management strategy is discussed.  
  Address Institute of Plant Sciences, Applied Entomology, Swiss Federal Institute of Technology, Clausiusstrasse 25/NW, CH-8092 Zurich, Switzerland  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0007-4853 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:12762860 Approved no  
  Call Number WIU @ je-engel @ Serial 70  
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