云杉小黑天牛生物学特性的研究

STUDY ON BIOLOGICAL PROPERTIES OF THE SPRUCE BEETLE

1987年5月6日,大兴安岭林区发生特大森林火灾以后,火烧迹地,贮木场云杉小黑天牛大量发生。在塔河林业局绣峰林业公司贮木场抽样调查中,原木被害率为54.07％,降等率为42.23％,每立方米损失约34.29元。云杉小黑天牛在该地区一年发生一代。以幼虫在木质部内越冬。5月下旬化蛹,高峰期为6月上旬;6月上旬成虫羽化,高峰期为6月下旬;产卵高峰期为7月初;孵化高峰期为7月上旬。卵期平均9d,蛹期平均19d,成虫期15—30d,幼虫期长达250—300d。

Spruce beetle (Monochamus sutor L.) occurs greatly at timber yards and on burned areas after the May 6 Fire in 1987. Results show that damage rate of lumber is 54.07% and the money lost is about 34.29 Yuan (RMB) per cubic meter in the Timber Yard of Xingan Mountains. In this area, the spruce beetle has one regeneration in a year with larva in winter in the xylem. Chrysalis begins during the last ten days of May with maximum at the first ten days of June. Adults emergence at the first ten days of June with maximum during the last ten days of June. The peak period for producing eggs happens at the beginning of July. The peak period for hatching occurs at the first ten days of July, the average period for chrysalis is 19 days, its eggs 9 days, adults 15—30 days, and lava 250—300 days.