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任何科学技术的利用,都要讲究经济效果。过去采用地面喷撒化学农药防治松毛虫,对当代幼虫虽然起到了一定防治效果,但防治成本费高,而且还伤害天敌,也不能控制松毛虫后代的危害。1981年以来,我们大面积推广飞机撒白僵菌防治技术,三年来共飞行作业174架次,作业防治面积69.6万
The use of any science and technology, we must pay attention to economic results. The past, the use of chemical pesticides spray ground control pine caterpillars, although the prevention and control of contemporary larvae have played a certain effect, but the cost of prevention and control is high, but also hurt the natural enemies, but also can not control the damage caused by the pine caterpillars. Since 1981, we have extensively promoted the technology of controlling Beauveria bassiana on aircraft. In the past three years, we have carried out 174 sorties of operations and the control area of operations has reached 696,000