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Non-host plant extracts reduce oviposition of Plutella xylostella (Lepidoptera: Plutellidae) and enhance parasitism by its parasitoid Cotesia plutellae (Hymenoptera: Braconidae)

Published online by Cambridge University Press:  09 March 2007

Shu-Sheng Liu*
Affiliation:
Institute of Insect Sciences, Zhejiang University, 268 Kaixuan Road, Hangzhou 310029, China
Yue-Hong Li
Affiliation:
Institute of Insect Sciences, Zhejiang University, 268 Kaixuan Road, Hangzhou 310029, China
Yong-Gen Lou
Affiliation:
Institute of Insect Sciences, Zhejiang University, 268 Kaixuan Road, Hangzhou 310029, China
*
*Fax: +86 571 86049815 E-mail: [email protected]

Abstract

Botanical preparations, usually from non-host plants, can be used to manipulate the behaviour of insect pests and their natural enemies. In this study, the effects of extracts of Chrysanthemum morifolium, a non-host plant of the diamondback moth, Plutella xylostella (Linnaeus), on the olfactory and oviposition responses of this phytophagous insect and on levels of parasitism by its specialist parasitoid Cotesia plutellae (Kurdjumov) were examined, using Chinese cabbage Brassica campestris L. ssp. pekinensis as the test host plant. Olfactometer tests showed that volatiles of chrysanthemum extract-treated host plants were less attractive to P. xylostella females than those from untreated host plants; and in contrast, volatiles of the chrysanthemum extract-treated host plants were more attractive to females of its parasitoid C. plutellae than those from untreated host plants. Oviposition preference tests showed that P. xylostella females laid only a small proportion of their eggs on chrysanthemum extract-treated host plants, while ovipositing parasitoid females parasitized a much higher proportion of host larvae feeding on the treated host plants than on untreated host plants. These results suggest that certain non-host plant compounds, when applied onto a host plant, may render the plant less attractive to a phytophagous insect but more attractive to its parasitoids. Application of such non-host plant compounds can be explored to develop push-pull systems to reduce oviposition by a pest insect and at the same time enhance parasitism by its parasitoids in crops.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2006

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