Colonization Rate of Several Antagonistic Bacteria against Tobacco Bacterial Wilt in Organic Fertilizers and Control Efficacy in Field

For effective prevention and treatment of bacterial wilt, a variety of antagonistic bacterial agents were added to bio-organic fertilizers and applied to tobacco fields. The effects of composite microbial agents added in the bioorganic fertilizers on tobacco beneficial soil microbes, pathogenic microorganisms, and on bacterial wilt control were studied. The results showed that 30%+70% of the dry tea pulverized tobacco stalks (bio-organic fertilizer C) added with antagonistic bacteria had better colonization, with colonization rate of Bacillus subtilis JK-4 and Bacillus amyloliquefaciens strain JK-10 reached 945.7% and 1970% in the biological organic fertilizer C. The Streptomyces strain LC-7 set in bio-organic fertilizer C with a colonization rate of 496.7 percent. The best prevention of bacterial wilt was obtained with this treatment, with a control effect of 57.40% during the fast growing period of tobacco and a control effect of 37.11% at the peak of incidence of bacterial wilt.