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苹果巢虫在省内果园每年都有发生,比较普遍,严重的影响果树产量。巢虫危害期正是果树开花盛期,不能使用化学农药,所以急需筛选出一种对花无害的高效药剂。经试验证明,7216是目前较为理想的防治苹果巢虫的药剂。7216生物杀虫剂是湖北省天门县微生物研究所从自然死亡的越冬红铃虫体中分离出一株能形成伴孢晶体的芽孢杆菌。该菌株繁殖力强,具有苏芸金杆菌的典型特征,伴孢晶体大,多呈短麦型,菌落圆形,表面粗糙,属于苏芸金杆菌一个新变种(Bacielusthurinqiensisvar tbanmensis)1977年,我所由省农科院引入菌种,采用土法生产粉剂,当年在苹果巢虫和天幕毛虫上做了室内杀虫效果试验。7216与引入的其它几种苏芸金杆菌相比较。杀虫效果显著。因此,78～79年由上海川沙县引来菌粉效价60亿/克,分别在盆栽山丁子上和田间果园做小面积试验。1980年进入中间试验。
Apple nest insects occur in orchards in the province every year, more common, seriously affecting the yield of fruit trees. The harmful period of the nestworm is the fruit tree blossom period, can not use the chemical pesticide, therefore urgently needs to screen out a kind of harmless efficient medicine. The test proved that 7216 is the ideal anti-apple nest insect medicine. 7216 Biopesticide is from Tianmen County, Hubei Province Institute of Microbiology isolated from the natural death of the overwintering red bollworm body can form a spore-forming Bacillus. The strain is characterized by strong propagation ability, typical characteristics of Bacillus thuringiensis, large spore crystals, mostly short stalk type, colony round shape and rough surface, belonging to a new variant of Bacillus thuringiensis strains (Bacielusthurinqiensisvar tbanmensis). In 1977, By the provincial Academy of Agricultural Sciences introduced strains of bacteria, the use of indigenous production of powder, then the apple nest insects and sky caterpillars made indoor insecticidal effect test. 7216 compared with several other Bacillus thuringiensis strains introduced. Insecticidal effect is remarkable. Therefore, from 78 to 79 years, the powder potency of Baicalin was attracted by Chuan Sha County in Shanghai to 6 billion g / g, and small-area experiments were conducted on the dwarf potted plants and field orchards respectively. In 1980 to enter the intermediate test.