Journal of Hunan Ecological Science

【Objective】This study aims to explore the control effect of three biological bacteria on radish soft rot, in order to provide a basis for green and scientific cultivation of radish. 【Method】Taking Baiyuchun radish as the research object, three types of biological bacteria, namely Bacillus polymyxa, Bacillus subtilis, and Streptomyces nonabsorbent, were used to determine the incidence of radish soft rot with three different application amounts, three application methods, and two application times. Variance analysis was conducted to study the control effect of biological bacteria on radish soft rot. 【Result】The control effect of three kinds of biological bacteria on radish soft rot was B. polymyxa>B. subtilis>Strepto- myces nonabsorbent, and the incidence rate was 26. 40% , 27. 79% , and 37. 50% of the control group, respectively. The greater the application amount increased, the more significant the effect was. The ap- plication of biological bacteria by spreading and watering was significantly better than that by spray, and the incidence rate of radish after the spreading and watering of B. polymyxa was less than 2% . There was no significant difference in the frequency of drug application. 【Conclusion】B. polymyxa and Bacillus subtilis had stable control effects on radish soft rot. The recommended application rate for B. polymyxa and B. subtilis was 500 ~ 800 g / 667 m2 and 200 ~ 300 g / 667 m2, respectively. It was recommended to mix with organic fertilizer for spraying or hole applications to save labor costs and allow for multiple appli- cations at once.

biological bacteria; radish; soft rot; Bacillus polymyxa; Bacillus subtilis; Streptomyces