Study on Co-toxicities of Organic Fungicides and Angulatin to Curvularia Lunata

The toxicity of 7 kinds of organic fungicides and angulatin was measured against curvularia lunata by mycelium growth rate test. And 8 toxicity regression equations and their EC50 were obtained.The stronger toxicity fungicides were filtrated.The result indicated that the EC50 values of diniconarole and inprodione were 1.4048E+1 and 2.2172E+1 respectively.The stronger toxicity was affirmatory in all the tested fungicides because the other's values were higher. But the toxicity of angulatin was sicklier to curvularia lunata.The experiment of co-toxicities of angulatin and diniconazole in 3∶7 showed that not only it put up more synergistic effect but also their actual relative inhibitory ratio was the biggest to curvularia lunata in all combinations. Its SR and actual inhibited ratio were 1.87 and 74.29 % respectively.