Measurement of the Toxicity of 8 Kinds of Fungicide

The toxicity of 8 kinds of the fungicide to the Bipolaris maydis and Curvularia Lunata was measured in lab and 16 toxicity curves and corresponding EC50 values were obtained.The highest toxicity synergistic interaction was estimated.The results showed Diniconazole was the cruelest to two kinds of pathogenic microorganism of corn in all tested fungicide.Their correlation coefficient of regression curve and EC50 was 0.883,1.8858E+1 and 0.973,1.4048E+1,respectively.Procymidone,chlorothalonil was so to Bipolaris maydis,but iprodione was weakly.The inhibitory action of Iprodione was exceed strong to Curvularia Lunata.Procymidone,mancozeb and thiram belonged to middle toxicity and kasugamycin,chlorothalonil,thiophanate-metlyl was weakly.Diniconazole and iprodione was synergistic interaction combination to Curvularia Lunata,when their volume was equated.Procymidone and diniconazole wasn't founded synergistic interaction combination to Bipolaris maydis.The mixture of chlorothalonil and diniconazole in 6∶ 4 and the mixture of procymidone and chlorothalonil in 2∶8 were synergistic interaction combinations to Bipolaris maydis.