强大小蠹生物学特性研究

Study on the biological characteristic of Dendroctonus valensle

强大小蠹 (Dendroctonus valens Le Conte)是近年来发现为害油松的国内新纪录种 ,1 998年在山西省阳城、沁水等县首次发现 ,此后在全省各地暴发成灾。该虫在榆次市、太岳山林区一年发生一代 ,主要以老熟幼虫和成虫在树干基部或根部的皮层内越冬 ,也有少数以 2龄～ 3龄幼虫或蛹越冬。越冬成虫于 5月中下旬大量出孔扬飞 ,6月上旬为产卵盛期 ,6月中旬为孵化盛期 ,8月中旬为化蛹盛期 ,9月上旬为子代成虫羽化盛期。越冬老熟幼虫于 7月中旬大量化蛹 ,7月下旬为羽化盛期 ,8月上中旬为产卵盛期 ,8月中旬为卵孵化盛期 ,发育不整齐 。

Dendroctonus valensle,a new record of insect to Chinese pine,was firstly found in Yangcheng,Qinshui,and other countries of Shanxi province,and then infested in most places of the province.This insect is one generation a year in Yuci city and Taiyue forest region,overwintering with mature larva and adult,or some 2 3 years of larva or pupa,in the bark of tree's base or foot.The overwintering adults goes out of holes and flies in May.Its full oviposition period is in early June,incubation in middle June,pupation in middle August,and emergence of the filial adults in early Sect.Pupation period of the overwinering mature larva is in middle July,emergence in last July,oviposition in early and middle Aug.incubation in middle middle Aug.Its development is uneven in time,existing generation overlapping.