浙江省余姚地区松褐天牛的生活世代

Life history of Monochamus alternatus Hope (Coleoptera:Cerambycidae) in Yuyao city,Zhejiang Province

松褐天牛Monochamus alternatus Hope是松材线虫(Bursaphelenchus xylophilus)病的主要传播媒介,明确松褐天牛的发生世代及成虫羽化规律对于松材线虫病的防控有着重要意义。本研究利用"塑料薄膜包裹松树树干、定期解除包裹供天牛产卵"的方法,系统研究了余姚地区松褐天牛的产卵规律及成虫的羽化规律。研究结果表明,成虫产卵期为5月上旬至8月下旬,高峰期出现在6月下旬至8月中旬。松褐天牛在浙江余姚多数为1年1代,部分为2年1代,95%以上的成虫集中在产卵后的第2年羽化,少数在第3年羽化。成虫自5月上旬开始羽化,高峰期出现在5月中旬到6月中旬,7月中旬羽化基本结束。

Monochamus alternatus Hope is one of the most important insect vectors of the pinewood nematode, Bursaphelenchus xylophilus. Understanding of the life history and biological characteristics of M. alternatus is therefore vital for the effective management of the pinewood nematode. Eggs of M. alternatus were collected every ten days from May to September. Stems with eggs in them were removed from the tree and placed in rearing cages after counting the number of oviposition holes in them. The emergence time of adults was then systemically monitored. The results show that M. alternatus adults oviposited from early May to late August, with a peak from late June to mid-August. In Yuyao city, more than 90% of M. alternatus could complete one generation in one year, but some needed 2 years to finish a complete life cycle. More than 95% of M. alternatus adults emerged in the year after oviposition by the previous generation but only a few emerged in the following year. M. alternatus adults emerged from early May to mid-July with a peak from mid-May to mid-June.