Biotic Factors Affecting Overwintering Population of Pissodes punctatus (Coleoptera: Curculionidae) in Northeast Yunnan Province of China

Authors

  • Song YANG Southwest Forestry University
  • Bolong ZHANG
  • Xianglin ZHUANG
  • Jufei XIA
  • Shouquan CHAI

Keywords:

Pissodes punctatus, biological control, woodpeckers, parasitoids, wood borers

Abstract

The mortality rate of overwintering population of the pine bark-weevil, Pissodes punctatus and causes of mortality were examined on newly infested host trees in Northeast Yunnan Province of China.  We found an 80.76% mortality rate of P. punctatus that was greatly higher than the healthy (survival) rate.  Life stages of overwintering population of this pest were overlapping including older larvae (3rd-4th instar) (71.20%), pupae (16.47%) and adults (12.32%). The causes of mortality were identified into different biotic factors, which included woodpecker predation, parasitism by insect parasitoids, tree resistance and undetermined diseases. Predation by woodpeckers (41.83%) was the dominant factor causing the mortality of immature stages of P. punctatus and significantly higher than the parasitism by insect parasitoids (18.99%), tree resistance (17.97%) and undetermined diseases (1.98%). Moreover, three hymenopteran ectoparasitoids (Triaspis sp., Rhopalicus sp. and Eurytoma sp.) were observed to attack immature stages of P. punctatus.  Triaspis sp. was the dominant species amounting 70.59% of the parasitoids, indicating a high potential in the biological control programme of P. punctatus. Relevance of these findings to biological control associated with forest management of P. punctatus was discussed. 

Author Biographies

Song YANG, Southwest Forestry University

Key Laboratory of Forest Disaster Warning and Control in Yunnan Province, Southwest Forestry University, Kunming, Yunnan 650224

Xianglin ZHUANG

Key Laboratory of Forest Disaster Warning and Control in Yunnan Province, Southwest Forestry University, Kunming, Yunnan 650224

Jufei XIA

ey Laboratory of Forest Disaster Warning and Control in Yunnan Province, Southwest Forestry University, Kunming, Yunnan 650224

Shouquan CHAI

Key Laboratory of Forest Disaster Warning and Control in Yunnan Province, Southwest Forestry University, Kunming, Yunnan 650224

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Published

2014-08-04

How to Cite

YANG, S., ZHANG, B., ZHUANG, X., XIA, J., & CHAI, S. (2014). Biotic Factors Affecting Overwintering Population of Pissodes punctatus (Coleoptera: Curculionidae) in Northeast Yunnan Province of China. Journal of the Entomological Research Society, 16(2), 117–125. Retrieved from https://www.entomol.org/journal/index.php/JERS/article/view/679

Issue

Section

Journal of the Entomological Research Society