皱鞘双条杉天牛生物学特性及防治研究

A Study on the Biology and Control of the Juniper Bark Borer Semanotus sinoauster Gressitt

皱鞘双条杉天牛 (SemanotussinoausterGressitt)是杉木的主要蛀干害虫之一 ,在镇雄县 1年发生 1代 ,少数为 2年 1代 ,以成虫在蛹室内越冬 .翌年 3月中旬开始外出活动并寻偶进行交尾 ,平均产卵量为 44粒 .3月中旬至 9月下旬为幼虫期 ,8月上旬至 9月上旬为蛹期 ,8月中旬至 9月下旬为成虫羽化时期并滞留于蛹室内越冬 .成虫主要产卵于衰弱木或频死木的粗皮下或树缝内 ,单产 ,少数 2～ 4粒 .生命表资料表明 ,天敌捕食、树脂淹死、病原菌侵染等是其自然种群的主要控制因子 .调查得知 :林龄、坡位、营林措施等对该虫发生有影响 ,适时进行透光间伐及虫害木的清理 。

The juniper bark borer Semanotus sinoauster Gressitt is one of the main borer pest of the Chinese fir.The insect has one generation a year in Zhengxiong County,Yunnan Province,a small part of its population can finish two generations in one year,which over winter by adults in pupal chambers.The adults come out of the tree trunk and mate up in middle March.Each adult lays 44 eggs in average.The larval stage lasts from middle March to late September.The pupal stage lasts from early August to early September.From middle August to late September,the adults emerge and stay in pupal chamber to overwinter.The adults lay eggs individually in bark cracks or under bark of the weak or dying trees,a small number of adults lay 2-4 eggs together.The life-table data of the insect shows that natural enemy preying,tree resin drowning,and germ infecting are the key factors to control its natural population.Investigating results also show that the occurrence of the insect is influenced by forest age,slope site,and forest management measure.The reproduction and development of the borer can be effectively limited by thinning,cutting and felling the infected trees.