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United States Department of Agriculture

Agricultural Research Service

Research Project: ECOLOGICALLY-BASED PEST MANAGEMENT STRATEGIES FOR WESTERN COTTON

Location: Pest Management and Biocontrol Research

Title: Coexistence and competition between tomicus yunnanensis and T. minor (Coeoptera: Scolytidae)in yunnan pine

Authors
item Lu, Rong Chun -
item Wang, Hong Bin -
item Zhang, Zhen -
item Byers, John
item Jin, You Ju -
item Wen, Hai Feng -
item Shi, Wen Jian -

Submitted to: Journal of Applied Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: December 12, 2011
Publication Date: January 1, 2012
Citation: Lu, R.C., Wang, H.B., Zhang, Z., Byers, J.A., Jin, Y.J., Wen, H.F., Shi, W.J. 2012. Coexistence and competition between tomicus yunnanensis and T. minor (Coleoptera: Scolytidae) in Yunnan pine. Psyche Vol. 2012, ID 185312, pp.1-6.

Interpretive Summary: We studied the competition and cooperation between two species of pest bark beetle, Tomicus yunnanensis and Tomicus minor (Coleoptera: Scolytidae) when they live together in Yunnan pine trees (Pinus yunnanensis L.) growing in Yunnan province in southwest China. We observed that T. yunnanensis beetles begin to disperse from shoots to trunks in November while most T. minor begin to transfer in December. T. yunnanensis mainly attacks the top and middle part of the trunk, whereas T. minor resides mostly in the lower and middle part of the trunk. The highest attack densities of these two species showed a similar pattern, with T. yunnanensis colonizing the upper section of the trunk and T. minor in the lower trunk. The highest attack density of T. Yunnanensis was about 297 egg galleries/m2, and the highest attack density of T. minor was about 305 egg galleries/m2. The two species colonize different areas of the tree, but with significant overlap for the same bark resource, and thus these behaviors reduce the intensity of competition for the relatively thin layer of phloem-cambium tissues.

Technical Abstract: This study investigated the competition and cooperation between Tomicus yunnanensis and Tomicus minor (Coleoptera: Scolytidae) when they coexist together in living Yunnan pine trees (Pinus yunnanensis L.) growing in Yunnan province in southwest China. We observed that T. yunnanensis bark beetles begin to disperse from shoots to trunks in November; and most T. minor begin to transfer in December. T. yunnanensis mainly attacks the top and middle part of the trunk, whereas T. minor mainly resides in the lower and middle part of the trunk. The highest attack densities of these two species showed a similar pattern, with T.yunnanensis colonizing the upper section of the trunk and T. minor in the lower trunk. The highest attack density of T. Yunnanensis was about 297 egg galleries/m2, and the highest attack density of T. minor was about 305 egg galleries/m2. The two species colonize different areas of the tree, but with significant overlap for the same bark resource, and thus these behaviors reduce the intensity of competition for the relatively thin layer of phloem-cambium tissues.

Last Modified: 7/30/2014
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