Biological characteristics of Colletotrichum gloeosporioides and inhibitory effects of eight fungicides

By using the crossing and haemocytometer method,the growth,spore production and other biological characteristics of Colletotrichum gloeosporioides were determined.In order to identify effective fungicides to control Colletotrichum gloeosporioides,toxicity of eight fungicides was tested by mycelial growth rate method.The results showed that the optimum temperature was 25-30℃ and the optimum pH was 5-6.The effective concentrations of the eight fungicides were obviously different.The inhibitory activities of flusilazole and tebuconazole were the highest with EC50 of 0.025 7 and 0.183 μg·mL-1,which were 1 395.55 and 195.99 times of Kresoxim-methyl,respectively.The inhibitory activities of difenoconazole and iprodione were the second with EC50 of 0.187 9 and 0.434 9 μg·mL-1.The inhibitory activities of kresoxim-methyl were the lowest.