Improved control of clubroot (Plasmodiophora brassicae) by a mixture of a fungicide and a plant defense inducer

The mixtures of 10 % cyazofamid SC and 25 % methiadinil SC were selected at different concentrations in root irrigation treatment of cruciferous crops and compared with 10 % cyazofamid SC to evaluate the chemical control of clubroot disease in field trials located in Dayi County (Sichuan Province, China) and Jiulong County (Sichuan Province, China), respectively. The results indicated that the effects of the test mixtures were better than that of a single treatment of 10 % cyazofamid SC. The mixture containing an effective ingredient dosage of 30 mg/L cyazofamid + 150 mg/L methiadinil was found to have the greatest effect. The combination of cyazofamid and methiadinil was effective in the control of clubroot and can be recommended for the treatment of soils highly infested with Plasmodiophora brassicae. The mixture is also effective in increasing crop yields.