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一九七三年我们进行了利用赤眼蜂防治玉米螟虫试验。收到了好于药剂防治的效果。在示范农场,利用赤眼蜂在30亩白鹤玉米地上防治第一代玉米螟。共放赤眼蜂三次,即6月22日、29日和7月3日,每次每亩放蜂两万头。对第一代玉米螟虫放赤眼蜂防治,放蜂区螟虫卵块被赤眼蜂寄生率为46.7％,对照区寄生率为2.4％;一代螟虫卵块孵化率,放蜂区为27.3％,对照区为86.6％。防治第一代玉米螟,对第二代玉米螟仍有后效,放蜂区第二代玉米螟卵块孵化率为17.3％,对照区为81.2％。放蜂区玉米被蛀茎株率为70％,茎折断株率为18％;颗粒剂防治区分别为90％和31％;对照区相应为96％和38％。可见,放蜂区明显地降
In 1973 we conducted a trial on the use of Trichogramma to control corn borers. Received better than the effect of chemical control. In the demonstration farm, Trichogramma was used to control the first generation of corn borer on 30 hectares of white crane corn. Tricholoma beetle were released three times, that is, June 22, 29 and July 3, each bee put twenty thousand per acre. The first generation of corn borer Trichogramma was used to control Trichogramma, the parasitism rate of Trichogramma stolonifer was 46.7% and the control was 2.4%. The hatch rate of the first generation of stem borer eggs was 27.3% 86.6%. Control of the first generation of corn borer, the second generation of corn borer still after effect, put the second generation of corn borer bee egg hatching rate was 17.3%, control area was 81.2%. In the bee-bloom area, the rate of eroded stems was 70% and that of stems was 18%; that of granules was 90% and 31% respectively; that of the control area was 96% and 38% respectively. Can be seen, put bee area decreased significantly