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1974年初,我县越冬代松毛虫发生面积3万亩,其中较为严重的虫口密度在100条以上。根据南方十三省(区)防治松毛虫研究协作会议制订的《防治松毛虫技术措施》要求,为了控制虫害发生,从2月21日开始,我们组织了力量,实行以“菌药兼施”的办法,开展对越冬代松毛虫的防治工作。这次防治时间前后共25天,用白僵菌粉9,120市斤,6%六六六粉8,150市斤,喷撒面积20,000亩,其中放菌面积17,500亩。防治用的白僵菌是新会白僵菌厂产品,质量为50亿/克和100亿/克。实行“菌药兼施”,菌与药的比例在1:3到1:1之间,具体配比视林分郁闭度和虫
At the beginning of 1974, the area of overwintering pine caterpillars in our county occurred in an area of 30,000 mu, of which the more serious pest population density was above 100. According to the requirements of “technical measures for prevention and control of pine caterpillars” formulated by the Collaboration Meeting on Prevention and Control of Dendrolimus in the Thirteen Provinces and Districts of the South of China, in order to control the occurrence of pests, from February 21, we organized forces to implement “ Approach to carry out prevention and treatment of overwintering pine caterpillars. The control time before and after a total of 25 days, with Beauveria bassiana powder 9,120 pounds, 6% BHC powder 8,150 pounds, spraying area of 20,000 acres, of which 17,500 acres of bacteria in the area. Beauveria bassiana used in the prevention and treatment of Beauvolech plant products, the quality of 5 billion / g and 10 billion / g. The implementation of ”bacteria and facilities", bacteria and medicine in the ratio of 1: 3 to 1: 1, the specific ratio depending on forest canopy density and insects