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HD—1是美国 Dulmage 于1970年从红铃虫上分离得到的一株苏云金杆菌,分类鉴定属于 Kurstaki变种,血清型 H3a—3b。1971年被美国确定为标准菌株,进行商品生产。我们自1977年从中国科学院动物所引入菌种,在棉铃虫、玉米螟上进行试验示范,取得良好效果。一、防治效果1977—1980年我们分别在石家庄、衡水、张家口三个地区的高邑县等5个县的社队,进行了试验示范,同时分寄有关协作单位共同试验,取得结果基本一致。1.防治棉铃虫:在二代棉铃虫一般发生年,可防治一次,大发生年则需防治两次。用HD一1的100倍菌液,(每毫升含活孢子1亿个)喷雾,或200倍菌液(每毫升0.5亿)涮棵,第三天虫口减退72.9—96.1%,平均90.4%;第五天虫口减退83.9—97.4%,平均
HD-1 is a strain of Bacillus thuringiensis isolated from American red bollworm by Dulmage in the United States in 1970. It belongs to Kurstaki variant, serotype H3a-3b. In 1971 the United States identified as a standard strain, the production of goods. Since 1977, we introduced the strain from the animal of Chinese Academy of Sciences and conducted experiment and demonstration on the cotton bollworm and corn borer, which achieved good results. I. Control Effect During 1977-1980, we conducted trial and demonstration in the communes of Gaoxi County and other five counties in Shijiazhuang, Hengshui and Zhangjiakou respectively. At the same time, we distributed the joint experiments with the relevant collaborating units and achieved basically the same results. 1. Control cotton bollworm: Helicoverpa armigera in the second generation of the general occurrence of the year, can be controlled once, the occurrence of large annual need to control twice. The fungus of 100 times of HD-1 was sprayed with 100 million live spores per ml, or 200 times of fungi (0.5 million per milliliter) were shabu-shan. On the third day, the population decreased 72.9-96.1% with an average of 90.4%. Insect on the fifth day 83.9-97.4% decline, average