Studies of controlling clubroot of Chinese cabbage

Mixed drug and drench were used to evaluated the control efficacy of 10 kinds of fungicides on clubroot of Chinese cabbage by pot experiments. Three pharmaceutical drugs selected by potted experiment were carried in field experiment. The results showed that the control efficacy of 50% fluazinam SC (1 g/m3) , 50% thiophanate-methyl WP (25 g/m3) , 70% mancozeb WP (35 g/m3) and 40% ouintozene WP (20 g/m3) were above 50% in pot experiments, which was better than drench treatment significantly. The control efficacy of 50% fluazinam SC (1 g/m3) was above 80% by pot experiment and field experiment, which was better than the control efficacy of other fungicides significantly.