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双尾天社蛾是张家口地区坝上四县杨树防护林带的主要害虫之一。近年来,随着林网化的实现,杨树害虫的危害也日趋严重。其中,食叶害虫双尾天社蛾尤为猖撅。据1975年统计,其为害面积达30万亩,以沽源、张北两县为最严重,虫株率一般在200—300条,个别可达1000条。为寻求生物防治的途径,我们在沽源县黄盖淖公社林网大队,分别于1974年8月11日至19日;1975年7月11日至19日,8月26日至29日,应用苏云金杆菌对双尾天社蛾作了防治试验。以笼养幼虫不喷药作为对照。试验采用铁丝笼饲养和在5米高的杨树林带进行喷药试验两种方法。苏云金杆菌兑水150倍,加少许洗衣粉。试验期间进行温湿度观察。
Two-tailed day moth is one of the major pests in the poplar shelterbelts in the four counties of Bashang in Zhangjiakou. In recent years, with the realization of forest network, the harm of poplar pests is also worsening. Among them, the leaf-eating insect pest two-tailed day is particularly rampant moths. According to the statistics of 1975, the damage area reached 30 million mu, with Guyuan and Zhangbei counties as the most serious. The worm strain rate is generally between 200 and 300 and the individual number may reach 1,000. In order to find a way to prevent and control biological diseases, we established a forest network brigade in Huangguilu commune in Guyuan County from August 11 to 19, 1974, July 11 to July 19, 1975, August 26 to August 29, The application of Bacillus thuringiensis to two-day-old moth made a prevention and control test. Caged larvae were not sprayed as a control. Two kinds of methods were used to feed the wire cage and spray test in the poplar belt with a height of 5 meters. Bacillus thuringiensis watered 150 times, plus a little detergent. During the test temperature and humidity observations.