余姚地区松幽天牛发生情况及其在枯死马尾松根部分布规律的初步研究

Preliminary Study on Occurrence and Distribution Regulation of Asemum amurense(Goleoptera: Aseminae) in Yuyao

调查了松幽天牛(Asemum amurense)在余姚地区的发生情况及其幼虫在枯死松树根内的分布规律。结果表明,松幽天牛在余姚地区1年发生1代,以幼虫在松树根内越冬。4月中旬开始化蛹,5月中旬成虫开始羽化,6月上旬成虫开始产卵,7月下旬卵开始孵化。松幽天牛在余姚地区的平均危害率达42.9%,其发生与土壤理化性质密切相关。松幽天牛幼虫在主、侧根内的分布数量差异显著,主根内的幼虫数显著多于侧根内。

Investigations were conducted on occurrence of Asemum amurenne in Yuyao,Zhejiang province and its distribution in the root of dead pine trees.The results showed that there is one generation a year of A.amureune in Yuyao,and overwinteres with larva in pine roots.The larva begins to pupate in mid-April.Adults emerge in Mid-May and lay eggs in early June.Eggs begin to hatch in late July.The average damage rate of A.amurense in Yuyao is 42.9%,and the occurrence is related closely with the physical and chemical characteristics of soil.The larva overwintered in the main roots are significantly much more than that in the lateral roots.And the control measures were also suggested.