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journal1 ›› 2015, Vol. 31 ›› Issue (6): 830-835.DOI: 10.16409/j.cnki.2095-039x.2015.06.003

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Key Environmental Factors Affecting Parasitism of Monochamus alternatus Hope by Dastarcus helophoroides Fairmaire

TANG Yanlong1, GAO Shangkun1, ZHANG Yanlong1, YANG Zhongqi1, LU Jifang2, ZHAN Maokui2, WANG Jian2   

  1. 1. Key Laboratory of Forest Protection of State Forestry Administration/Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;
    2. Zunyi Institute of Forestry, Zunyi 563000, China
  • Received:2015-03-16 Online:2015-12-08 Published:2015-12-17

Abstract: Dastarcus helophoroides (Fairmaire) is an important parasitoid of Monochamus alternatus Hope in China, but shows varying parasitism depending on the microenvironment. The influence of key environmental factors on parasitism by D. helophoroides was investigated. Fifteen environmental factors of 65 plots were surveyed, and the data were related to parasitism rate by stepwise regression analysis. The results showed that there was a significant positive correlation between slope position and parasitism rate, and a significant negative correlation between crown density and parasitism rate. Using these two key factors, a multiple regression model was established for forecasting the parasitism by D. helophoroides. The average difference degree was detected to be 0.2209, which indicates the model is suitable for forecasting the parasitism rate. These studies provide a basis for releasing the parasitoid to control the longhorn beetles.

Key words: Dastarcus helophoroides, Monochamus alternatus, parasitism, environmental factors

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