Toxicity Measurement of Six Fungicides to Phytophthora nicotianae

The toxicities of six fungicides,dimethomorph,fluopicolide-propamocarb,dimethomorph-mancozeb,fenaminosulf-sulphuy,lier,and metalaxy-mancozeb,were tested with the growth rate method.The results showed that 50% dimethomorph,69% dimethomorph-mancozeb and 68.75% fluopicolide-propamocarb had better control effects.Superior to the others,50% dimethomorph's EC₅₀ value was 1.2704 μg/mL;and the effects of 60% fenaminosulf-sulphuy and 50% lier were good with the EC₅₀ of 304.2533 μg/mL and 371.1388 μg/mL,respectively.The EC₅₀ of 72% metalaxy-mancozeb was the highest,610.1751 μg/mL.