如何正确评价用松毛虫赤眼蜂防治玉米螟的问题,有的同志有怀疑,对这个问题,谈谈我们的看法: 一、利用松毛虫赤眼蜂防治二代玉米螟,能够提高螟卵寄生率,压低虫口控制为害。 自1974年,我县一直利用松毛虫赤眼蜂防治2代玉米螟,1980防治面积22.8万亩,放蜂区较对照区寄生率显著提高,历年稳定在80％左右(1978年为78.98％、1979年为81.91％,1980年为78.71％),但自然寄生 How to correctly evaluate the use of trichogramma trichogramma to control the corn borer, some comrades have doubts about this issue, to talk about our views: First, the use of Trichogramma Trichogramma second generation prevention and control of corn borer can improve the eggs borer parasitic Rate, down insect control damage. Since 1974, the county has been using Trichogramma Trichogramma second generation prevention and control of corn borer, 1980 prevention and control area of ​​228,000 mu, the parasitic rate of bee area compared with the control area significantly increased over the years stabilized at about 80% (78.98% in 1978, 81.91% in 1979 and 78.71% in 1980) but naturally parasitized