Mathematical Analysis of the Inhibitory Effects of Ten Kinds of Fungicides Applied on Apple

Apple ring rot is one of the three major diseases of apple, which seriously affects the yield and quality of apple. At present, chemical agents are mainly used to prevent and control apple ring rot. In this study, 10 kinds of low virulence fungicides were selected. The inhibitory effects of 10 kinds of fungicides on Botryosphaeria dothidea were determined. The results indicated that 50% carbendazim and 70% thiophanate methyl had the best mycelial growth inhibition effect among 10 kinds of fungicides. The inhibitory effect of 50% carbendazim on hyphae was 91.63% under the concentration of 400 times dilution, the inhibitory effect of 70% thiophanate methyl on hyphae was 90.31% under the concentration of 500 times dilution, and there were recommended to use.