Toxicity Determination of Six Fungicides on Early Blight of Tomato

In this paper,the inhibition of tomato early blight 6 fungicides was determined by using mycelial growth inhibition rate way,and received six regression equations and the inhibition of virulence effective concentration(EC50) are obtained.The results showed that 6 fungicides on tomato early blight inhibit the growth of pathogenic bacteria,but there are differences between the different agents of tomato early blight pathogen EC50 from low to high were 25% Jinlishi EC,25% Jujia EC,10% Shigao WG,70% Namixin WP,250 g/L Amistar SC and 70% Mancozeb WP.The result also indicated that the best inhibition effect was 25% Jinlishi EC,25% jujia EC and 10% Shigao WG took second place,70% Namixin WP,250 g/L Amistar SC are better than the others,70% Mancozeb WP was the worst.