Abstract:To obtain antagonistic bacterium combination with dual effects for disease control and growth-promotion, Bacillus sp. combination screening was carried out. According to the results of antagonistic experiments and growth characterization, the 12 strongly antagonistic bacterial strains screened previously were mixed into combinations. By in vitro antagonistic examination, 23 combinations with superior suppressive effect than mono antagonistic strains were obtained. By further in vivo inoculation test, the combination BCL-8 was shown to have remarkable disease control and growth-promoting effects. The combination BCL-8 could promote seed sprouting of processing tomato. When treated with BCL-8, the seeds germination rate increased 10%, and the seedling height, fresh weight and dry weight of processing tomato seedlings increased 66.58%, 176.19% and 143.75%, respectively. The control efficacy of the combination BCL-8 to seedling Rhizoctonia rot of processing tomato were 40.08％ and 55.42% under greenhouse and field conditions, respectively. The combination BCL-8 also increased production of processing tomato 24.32% in the field. The results make the basis for applying the combination BCL-8 on processing tomato production in Xinjiang.