| In order to research the influence of Bacillus subtilis strain R31 on fusarium wilt and rhizospheric microorganism of dwarf banana, the biocontrol effect and rhizospheric microorganism of Musa spp. ABB cv. Zhongfen No.1 applied wettable powder of strain R31 were investigated . In the treatment area, the banana seedlings were irrigated by 1000 mL 1.0 伊106 CFU/mL spores of strain R31 per plant five times totally. Before harvest, the disease incidence in different phenotypes of Zhongfen NO.1 were investigated and the rhizosphere soil samples of different phenotypes and health status were collected. The results showed that the average control efficiency were 44.00%, biocontrol effect on “green stem冶p” henotype of Zhongfen NO.1 was only 23.00% , while it on “red stem” phenotype reached 56.14%. Microbial counting results indicated that after applying R31, the number of cultivable rhizospheric bacteria increased, but the numbers of cultivable fungi, actinomycetes and fusarium were decreased. It suggested that the control effect of strain R31 on fusarium wilt was associated with the adjustment on rhizospheric microorganisms. |
