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松毛虫小盾寄蝇 Nemosturmia amoena 是草地螟的主要寄生天敌。寄生率可达8.4%(室内饲养记载)是一个主要天敌种群。松毛虫小盾寄蝇在雁北区一年发生一代,以围蛹在草地螟幼虫体内越冬。翌年6月上旬羽化成蝇,刚羽化有寻找阴暗处避光的习性,随即取食(作物上的分泌物和露水),成虫飞翔力强。大量取食后交尾,交尾时间1～3分钟,卵犬部产在作物上部嫩叶上,卵期8～10天。6月18～20日孵化为幼虫,幼虫附着力强。当第一代草地螟发生为害时,松毛虫小盾寄蝇的幼虫附着在害虫体壁上并侵入体腔进行寄生,(在寄主体内1～3龄)幼虫期长达60天。8月底至9月初寄蝇幼虫在草地螟寄主体内化蛹,围蛹期达10
Dendrolimus small shield flies Nemosturmia amoena is the main parasitic natural enemies of Meadow Stem Borer. Parasitism up to 8.4% (recorded in house keeping) is a major predator population. Moth caterpillar small shield flies occurred in Yanbei District a year, to the pupal in the grass borer larva winter. In the following year in early June feather into a fly, just eclosion to find the shade dark habit, then feeding (crop secretions and dew), adult flying ability. After feeding a large number of post-mating, coping time of 1 to 3 minutes, parthenoocephalic produce in the upper leaves of young crops, the egg period of 8 to 10 days. June 18 ~ 20 hatch larvae, larvae strong adhesion. When the first generation of Meadow Stem Borer is damaged, the larvae of the pine mullet with small shield flies are attached to the body wall of the pest and invade into the body cavity for parasitism (larvae of 1 to 3 years old in the host) up to 60 days. From late August to early September, the fly larvae send pupae within the host of grass flies, and the pupal stage reaches 10