The Tea Weevil, <Emphasis Type="Italic">Myllocerinus aurolineatus</Emphasis>, is Attracted to Volatiles Induced by Conspecifics |
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Authors: | Xiao-Ling Sun Guo-Chang Wang Xiao-Ming Cai Shan Jin Yu Gao Zong-Mao Chen |
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Affiliation: | (1) Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, 310008, China;(2) Henan Institute of Science and Technology, Xinxiang, 453000, China;(3) Zhejiang Academy of Agricultural Sciences, Hangzhou, 310008, China; |
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Abstract: | The tea weevil, Myllocerinus aurolineatus (Voss) (Coleoptera: Curculionidae), is a leaf-feeding pest of Camellia sinensis (O.Ktze.) with aggregative behaviors that can seriously reduce tea yield and quality. Although herbivore-induced host plant
volatiles have been shown to attract conspecific individuals of some beetle pests, especially members of the Chrysomelidae
family, little is known about the volatiles emitted from tea plants infested by M. aurolineatus adults and their roles in mediating interactions between conspecifics. The results of behavioral bioassays revealed that
volatile compounds emitted from tea plants infested by M. aurolineatus were attractive to conspecific weevils. Volatile analyses showed that infestations dramatically increased the emission of
volatiles, (Z)-3-hexenal, (Z)-3-hexenol, (E)-β-ocimene, linalool, phenylethyl alcohol, benzyl nitrile, indole, (E, E)-α-farnesene, (E)-nerolidol, and 31 other compounds. Among the induced volatiles, 12 chemicals, including γ-terpinene, benzyl alcohol, (Z)-3-hexenyl acetate, myrcene, benzaldehyde, (Z)-3-hexenal, and (E, E)-α-farnesene, elicited antennal responses from both sexes of the herbivore, whereas (E)-β-ocimene elicited antennal responses only from males. Using a Y-tube olfactometer, we found that six of the 13 chemicals,
γ-terpinene, benzyl alcohol, (Z)-3-hexenyl acetate, myrcene, benzaldehyde, and (Z)-3-hexenal, were attractive to both males and females; two chemicals, (E/Z)-β-ocimene and (E, E)-α-farnesene, were attractive only to males; and four chemicals, (E)-4,8-dimethyl-1,3,7-nonatriene, phenylethyl alcohol, linalool, and (Z)-3-hexenol, were attractive only to females. The findings
provide new insights into the interactions between tea plants and their herbivores, and may help scientists develop new strategies
for controlling the herbivore. |
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