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Response of the elm leaf beetle to host plants induced by oviposition and feeding: the infestation rate matters.

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Bibliographic Details
Title: Response of the elm leaf beetle to host plants induced by oviposition and feeding: the infestation rate matters.
Authors: Meiners, T., Hacker, N. K., Anderson, P., Hilker, M.
Source: Entomologia Experimentalis et Applicata. Apr2005, Vol. 115 Issue 1, p171-177. 7p.
Subjects: Elm, Host plants, Chrysomelidae, Eulophidae, Beetles
Abstract: We investigated by olfactometry and feeding- and oviposition-choice-tests how the highly specialised elm leaf beetle,Xanthogaleruca luteolaMüller (Coleoptera: Chrysomelidae),responds to conspecifically induced defences in the field elmUlmus minorMiller (Ulmaceae). While egg deposition of the beetle induced elms to release volatiles attractive to the egg parasitoidOomyzus gallerucaeFonscolombe (Hymenoptera: Eulophidae), feeding alone did not. In the present study, females of the elm leaf beetle showed preferences for the odours of twigs induced by low egg deposition and feeding over odours from uninfested twigs. In contrast, heavy infestation rendered elm odours less attractive to the beetles. Feeding and oviposition bioassays revealed an oviposition preference for leaves from uninfested twigs when compared to locally infested leaves. However, beetles preferred to feed upon systemically induced leaves compared to uninfested ones. The different preferences of the elm leaf beetle during host plant approach might be explained by a strategy that accounts for both gaining access to high quality nutrition and avoiding competition or parasitism. [ABSTRACT FROM AUTHOR]
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Database: Psychology and Behavioral Sciences Collection
Description
Abstract:We investigated by olfactometry and feeding- and oviposition-choice-tests how the highly specialised elm leaf beetle,Xanthogaleruca luteolaMüller (Coleoptera: Chrysomelidae),responds to conspecifically induced defences in the field elmUlmus minorMiller (Ulmaceae). While egg deposition of the beetle induced elms to release volatiles attractive to the egg parasitoidOomyzus gallerucaeFonscolombe (Hymenoptera: Eulophidae), feeding alone did not. In the present study, females of the elm leaf beetle showed preferences for the odours of twigs induced by low egg deposition and feeding over odours from uninfested twigs. In contrast, heavy infestation rendered elm odours less attractive to the beetles. Feeding and oviposition bioassays revealed an oviposition preference for leaves from uninfested twigs when compared to locally infested leaves. However, beetles preferred to feed upon systemically induced leaves compared to uninfested ones. The different preferences of the elm leaf beetle during host plant approach might be explained by a strategy that accounts for both gaining access to high quality nutrition and avoiding competition or parasitism. [ABSTRACT FROM AUTHOR]
ISSN:00138703
DOI:10.1111/j.1570-7458.2005.00280.x