螟虫长距茧蜂是玉米螟幼虫的重要天敌,一年发生2—3代,以卵或低龄幼虫在寄主体内越冬。自然寄生率为30—40％,最高70％。该蜂为多胚生殖昆虫,主要寄生1—4龄玉米螟幼虫,以3龄寄生率为最高。一头玉米螟(3龄)可育蜂39.12头,一头雌蜂可寄生玉米螟11.7头,繁殖子代460.05头。试验证明:人工繁殖和释放可提高田间玉米螟寄生率。 Borer borer Larvae is an important natural enemy of corn borer larvae, occurs 2-3 generations a year, with eggs or young larvae in the host winter. Natural parasitic rate of 30-40%, up to 70%. The bee polyembryonic reproductive insects, the main parasitic 1-4-day-old corn borer larvae, parasitic rate to the highest for the third instar. 39.12 heads of one corn borer (3rd instar), one 11.8 heads of female corn borer and 460.05 heads of offspring. Experiments show that: Artificial propagation and release can increase the parasitic rate of field corn borer.