Control Effect of Mitaijunjing 6% AS against Cucumber Powdery Mildew

Potted experiments were conducted to determine efficiency of the 6% Mitaijunjing aqueous solutions(AS) against cucumber powdery mildew. The result showed that Mitaijunjing has protecting and curing effects on Sphaerotheca fuliginea. Mitaijunjing AS is a mixed bioformulation consisting of a novel biological fungicide Cytosinpetidemycin and copper sulfate. With a concentration over 60 mg/L, the control efficiency of Mitaijunjing against cucumber powdery mildew was better than that of Triadimefon(150 mg/L). The control efficiency of Mitaijunjing at 150 mg/L suspension in cucumber seedling stage was over 80%. Mitaijunjing possessed good systematic which was able to conduct up and down in plants, and the downward conductivity was dominant. Mitaijunjing 6% AS diluted at 75 mg/L provided 83.85% relative control effect, which was significantly better than that of Triadimefon 15% WP at 300 mg/L in the field experiments. Mitaijunjing is safe to cucumber leaves and fruits in all experiments.