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螟虫长距茧蜂是玉米螟幼虫的主要寄生性天敌。该天敌各虫态的历期,随温度升高及寄主龄期增高而缩短。成蜂喜欢在3—4龄寄主体内寄生。产卵量在时间上的分布是首尾低中间高。该天敌的抗药性较差,常用农药使用6天后对成蜂的杀伤率仍达20—30％。三因子三水平的正交试验(笼网放蜂)表明。该天敌对玉米螟寄生率的高低与释放天敌的数量、玉米螟虫口密度有关。大田小面积放蜂表明,每亩放蜂500—700对,玉米螟当代幼虫的被寄生率达31.7—42.6％,下代幼虫的被寄生率达51.0—63.0％。
Borer long-billed bees is the main parasitoid enemy of corn borer larvae. The natural enemies of each insect state of the period, with the temperature rise and the host age increased and shortened. Bees love to parasitize in 3-4-year-old hosts. The distribution of fecundity in time is high at the beginning and end of the middle. The natural enemies of the poor resistance, commonly used pesticides 6 days after the bee killing rate is still up to 20-30%. Orthogonal experiment of three factors and three levels showed that. The natural enemies of corn borer parasitic rate of the level of natural enemies and the number of release, corn borer population density related. Small-area field beekeeping showed that 500-700 pairs of bees per mu were bee parasitized. The parasitism rate of the contemporary larvae of the maize borer was 31.7-42.6% and that of the next generation larvae was 51.0-63.0%.