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Intraspecific and interspecific attraction of three Tomicus beetle species during the shoot-feeding phase

Published online by Cambridge University Press:  30 January 2015

J. Wang
Affiliation:
Key Laboratory of Forest Protection of State Forest Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
Z. Zhang*
Affiliation:
Key Laboratory of Forest Protection of State Forest Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
X. Kong
Affiliation:
Key Laboratory of Forest Protection of State Forest Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
H. Wang
Affiliation:
Key Laboratory of Forest Protection of State Forest Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
S. Zhang
Affiliation:
Key Laboratory of Forest Protection of State Forest Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
*
*Author for correspondence Fax: +86 10 62884972 Phone: +86 10 62889567 E-mail: [email protected]

Abstract

The shoot beetles Tomicus minor, Tomicus yunnanensis, and Tomicus brevipilosus have been decimating Pinus yunnanensis trees for more than 30 years in Southwestern China. To understand the chemical ecological relationship between pines and Tomicus, and among the three beetle species, we compared the attraction of these beetles to damaged shoots, extracts from damaged shoots, and volatiles from damaged shoots collected by the dynamic headspace sampling method. Experiments were performed using a modified open-arena olfactometer. The male T. minor and both sexes of T. brevipilosus were more strongly attracted to damaged shoots than to undamaged shoots and they showed attraction to shoots damaged by the same species. Female T. minor and both sexes of T. yunnanensis were attracted to shoots damaged by female T. brevipilosus. The three beetle species were attracted to shoot extracts and dynamic headspace volatiles from shoots damaged by the same species and sex. Female T. minor and male T. yunnanensis were also attracted to dynamic headspace volatiles from shoots damaged by both sexes of T. brevipilosus. The results suggested that specific semiochemicals that are induced or produced by T. brevipilosus also attract T. minor and T. yunnanensis. The semiochemicals in damaged shoots affect the attraction of the three beetle species and play an important chemical communication role in weakening the host trees during the beetles’ shoot-feeding phase.

Type
Research Papers
Copyright
Copyright © Cambridge University Press 2015 

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