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1984年8月2日,我县在黄口乡西河村,用湖北省农科院植保所微生物实验工厂生产的苏云金杆菌(B.t)乳剂,进行了防治三代棉铃虫大田小区药效试验。 该项试验4个处理,2次重复,共8个小区,每小区面积0.1亩,各处理是:B.t乳剂200、250和300倍液,喷清水作对照,田间小区其它因素相同。每处理定点定株调查百头棉铃虫幼虫。8月2—4日为卵盛孵期,喷药时间8月2日,喷药液量每小区10斤。喷药1天后各处理无死虫,喷药后3、5、7、9各天检查,200和250倍液的死亡率都是100％,300倍液的校正死亡率分别是94.9、96.8、100、和100％。因而肯
August 2, 1984, the county in Huanghe Township, West Village, with the Hubei Academy of Agricultural Sciences plant microbial test plant production of Bacillus thuringiensis (B.t) emulsion, were three generations of cotton bollworm efficacy test field. The test 4 treatments, 2 repetitions, a total of 8 plots, each plot area of 0.1 acres, the treatment is: B.t emulsion 200, 250 and 300 times the liquid spray control, the same other factors in the field plot. Each treatment site-specific survey of one hundred cotton bollworm larvae. August 2-4 ovulation Sheng incubation period, spraying time on August 2, spray liquid volume of 10 kg per plot. After 1 day of spraying, no dead insects were treated, 3,5,7,9 days after spraying were examined, the mortalities of 200 and 250 times were 100%, and the corrected mortalities of 300 times were 94.9 and 96.8 respectively. 100, and 100%. So Ken