Selection of Bactericides for ControllingBacterial Soft Rot of Banana

【Objective】The study was to screen bactericides for controlling soft rot of banana.【Method】The minimal inhibit concentration, detached leaves and pot experiments were adopted to study the control effects of different bactericides on soft rot of banana.【Result】Streptomycin sulfate, benzylpenicillin potassium and zhongshengmycin had strong inhibitory capacity, with minimal inhibitory concentrations of 0.2 μg/mL, 3.12 μg/mlL and 6.25 μg/mL, respectively. But copper oxychloride and thiodiazole copper had low toxicity to the bacteria, with the minimal inhibitory concentrations of 200 μg/mL and 400 μg/mL, respectively. According to the determination results of detached leaf method, the control effects of 400 μg/mL copper oxychloride, thiodiazole-copper and streptomycin sulfate were the best, with control rates of 97.67%, 96.34% and 95.12%, respectively. When copper oxychloride and thiodiazole copper were sprayed after being inoculated with pathogen in pot experiments, the control effects of 30% copper oxychloride SC 600 times solution and 20% thiodiazole-copper SC 500 times solution were optimal, with control rates of 79.37% and 80.15% onthe 12th day after spraying. While the two bactericides were sprayed before being inoculated with pathogen in pot experiments, the control effects of 30% copper oxychloride SC 600 times solution and 20% thiodiazole copper SC 500 times solution were 87.01% and 89.23% on the 12th day after spraying.【Conclusion】Copper oxychloride and thiodiazole copper could be recommended as green bactericides in controlling soft rot of banana.