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通过对内蒙古阿尔山地区落叶松八齿小蠹Ipssubelongatus Motschulsky天敌的种类调查,目前共发现落叶松八齿小蠹天敌包括捕食性天敌红胸郭公虫Thanasimus substriatus Gebler,寄生性天敌暗绿截尾金小蜂Tomicobia seitneri(Ruschka)、长蠹刻鞭茧蜂Coeloides bostrichorum Giraud以及螨类、微生物。分析了天敌的自然控制作用,红胸郭公虫对落叶松八齿小蠹成虫的日均捕食率为3.1%±0.77%(落叶松八齿小蠹成虫20头和红胸郭公虫成虫1头,室外12～24℃),日最大捕食量为10.7头(1头红胸郭公虫成虫与20、40、60和80头、100头落叶松八齿小蠹成虫,室内17～25℃);暗绿截尾金小蜂对落叶松八齿小蠹幼虫的寄生率为20.5%,对其蛹的寄生率为13.7%;长蠹刻鞭茧蜂对其幼虫的寄生率为6.5%;螨类对其成虫的寄生率为20.2%;而微生物对落叶松八齿小蠹幼虫的寄生率为4.3%,对蛹的寄生率为5.4%,对成虫的寄生率为2.1%。暗绿截尾金小蜂是落叶松八齿小蠹最有利用价值的天敌昆虫。
Through the investigation on the species of Ipssubelongatus Motschulsky larch in the Alashan Mountains in Inner Mongolia, a total of 12 natural enemies of the larch (Pinus densiflorus), including predatory predators Thanasimus substriatus Gebler, Bee, Tomicobia seitneri (Ruschka), Coeloides bostrichorum Giraud, and mites and microorganisms. The natural control effect of natural enemies was analyzed. The average daily predation rate of adult T. larch adults was 3.1% ± 0.77% (adults of Larix principis- Outdoor 12 ~ 24 ℃), the maximum daily predation amount was 10.7 (1 adults of T. aurantiaca and 20, 40, 60 and 80 heads, 100 adults of Larix principis-rupprechtii, indoor 17-25 ℃); dark The parasitism rate of green clump of golden beetle to larvae of Larix principis-rupprechtii was 20.5% and the parasitism rate to its pupae was 13.7%. The parasitism rate of beetle beetle to its larvae was 6.5% The parasitism rate of adults was 20.2%. However, the parasitism rate of microorganisms to larvae of Pinus tabulaeformis was 4.3%, the parasitism rate to pupae was 5.4%, and the parasitism rate to adults was 2.1%. Dark green clump of golden bees is the most valuable value of natural enemies insects.