Inhibitive Efficacy of Bio-agent against Powdery Mildew Disease on Organic Cucumber in Greenhouse

In this study, we investigated the control efficacy of Bacillus subtilis wettable powder(WP)(1×109cfu/g) and oligosaccharins against powdery mildew in organic cucumber production. The results showed that, spraying with 200 times dilution of B. subtilis WP or 700 times dilution of oligosaccharins could control powdery mildew disease effectively while the disease was less serious, and the control efficiency reached to 87.2%-90.7% and 52.5 %-91.5% respectively. In addition, the bio-agent 200 times dilution of B. subtilis WP should be used before the cucumber powdery mildew disease was serious or the disease index was less than 10 in organic cucumber production.