Toxicity and Field Control Efficiency of Several Fungicides Against Botrytis cinerea

Taking disease leaves which infected by Botrytis cinereain the field as materials,the toxicity of 11 fungicides against Botrytis cinerea were tested by mycelium growth rate method in laboratory,and 8fungicides with better efficiency were selected to test in the field.The results showed that,in laboratory that 25% prochloraz EC had the best toxicity against Botrytis cinerea,of which the EC50 value was 0.0397μg/mL.40% pyrimethanil SC,40%chlorothalonil SC and80% mancozeb WP also had better toxicity to Botrytis cinerea.The results of field trials showed that 25% prochloraz EC,28% ene oxime carbendazim WP,50% boscalid WG and 50%iprodione SC had high control effect,which were85.57%,82.68%,80.92% and 73.34%,respectively.The effective fungicides were screened out,which provided an important directive to control the disease.