Abstract
The vast majority of studies of plant indirect defense strategies have considered simple tritrophic systems that involve plant responses to attack by a single herbivore species. However, responses by predators and parasitoids to specific, herbivore-induced, volatile blends could be compromised when two or more different herbivores are feeding on the same plant. In Y-tube olfactometer studies, we investigated the responses of an aphid parasitoid, Diaeretiella rapae (McIntosh) (Hymenoptera: Braconidae), to odors from cabbage plants infested with the peach-potato aphid Myzus persicae (Sulzer) (Homoptera: Aphididae), in both the presence and absence of a lepidopteran caterpillar, Plutella xylostella L. (Lepidoptera: Plutellidae). Female parasitoids chose aphid-infested plants over uninfested plants but did not distinguish between caterpillar-infested and uninfested plants. When given a choice between odors from an aphid-infested plant and those from a plant infested with diamondback moth larvae, they significantly chose the former. Furthermore, the parasitoids responded equally to odors from a plant infested with aphids only and those from a plant infested with both aphids and caterpillars. The results support the hypothesis that the aphid and the caterpillar induce different changes in the volatile profile of cabbage plants and that D. rapae females readily distinguish between the two. Furthermore, the changes to the plant volatile profile induced by the caterpillar damage did not hinder the responses of the parasitoid to aphid-induced signals.
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The first author is indebted to the Biotechnology and Biological Sciences Research Council (BBSRC) of the UK for financial support via the Underwood Fund and to The British Council for sponsoring the academic link with Rothamsted Research. Rothamsted Research receives grant-aided support from the BBSRC.
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Agbogba, B.C., Powell, W. Effect of the Presence of a Nonhost Herbivore on the Response of the Aphid Parasitoid Diaeretiella rapae to Host-infested Cabbage Plants. J Chem Ecol 33, 2229–2235 (2007). https://doi.org/10.1007/s10886-007-9379-x
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DOI: https://doi.org/10.1007/s10886-007-9379-x