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1975年我们利用赤眼蜂防治棉田三代玉米螟兼治四代棉铃虫获得了良好效果,1976年全大队放蜂面积扩大为1,160亩,其中防治棉田三代玉米螟兼治四代棉铃虫600亩,1977年又增达1,416亩,防治棉田三代玉米螟兼治四代棉铃虫为757亩,先后放蜂三次,每次每亩放蜂一万头左右。在三代玉米螟发生期放蜂于玉米诱集带上,第二、三次放蜂于棉花上,每隔三天放蜂一次。经调查夏玉米诱集带上玉米螟的卵寄生率达100％,棉花上玉米螟的卵寄生率为91％。1976年
In 1975, we used Trichogramma to control the three generations of corn borer in cotton field and achieved good results in four generations of cotton bollworm. In 1976, the area of the entire brigade was expanded to 1,160 mu, of which 600 mu was controlled by three generations of cotton borer and four generations of cotton bollworm. And up to 1,416 acres, prevention and treatment of three generations of cotton field corn borer and four generations of cotton bollworm 757 acres, has put the bee three times, each bee put about ten thousand bees. During the third generation of corn borer, bee pollination was carried on the corn trapping belt, and the second and third beekeeping was carried out on cotton. The beekeeping was carried out once every three days. The parasitism rate of the maize borer was 100% after the summer mats were trapped and the parasitism rate of the maize borer was 91%. 1976