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1976年我场有30多亩华山松林发生华山松球蚜。1977年危害面积扩大到100多亩。6月上旬,我们对30多亩严重受害区,采取了引瓢助迁的方法进行了生物防治试验。1.引瓢助迁的方法:1977年6月4
In 1976, I had more than 30 acres of Huashan pine forest pine aphid. Hazardous area in 1977 expanded to 100 mu. In early June, we conducted a series of biological control experiments on the 30-mu-severely-affected area by adopting the method of attracting and supporting cadres. 1. Guide cited to help move the way: June 1977 4