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我场1976年越冬代的松毛虫,主要发生在林木郁闭度0.3—0.4的疏残林中,平均每株树有虫3—5条。根据过去的经验,在这样的地区使用白僵菌进行防治是难以收到良好效果的。为了进一步找出其原因,认识和掌握白僵菌治虫的规律,我场领导、工人、技术员三结合小组,开展了防虫试验。三月间,选择了常风大、林地干旱、过去用白僵菌防治极少起作用的儒洞分场进行了施放,试验面积58亩,喷撒高州县微生物厂生产的自僵菌粉70斤,放菌后十五天内的天气也都是干旱的,平均相对湿度84%,温度19.1℃,仅在放菌后第9天下了
My field over the winter of 1976, the pine caterpillars, mainly in the canopy density 0.3-0.4 forest, with an average of 3-5 insects per tree. Based on past experience, it is difficult to receive good results using Beauveria bassiana in such areas. In order to further find out the reason and know and master the rule of Beauveria bassiana, my field leaders, workers and technicians combined three groups to carry out the pest control test. In March, Changfeng was chosen and the woodland was arid. In the past, the Confucian cave sub-field that played a very small role in the control of Beauveria bassiana had been put into operation with a test area of 58 mu. The autotrophic bacteria powder 70 produced by Gaozhou County Microbiological Plant Kg, the weather within fifteen days after inoculation is also arid, with an average relative humidity of 84% and a temperature of 19.1 ° C, only 9 days after inoculation