安徽省栝蒌叶枯病菌对4种杀菌剂的敏感性

Sensitivity of Alternaria alternata in Trichosanthes kirilowii to four fungicides in Anhui Province

由致病性链格孢引起的叶枯病是栝蒌生产上出现的一种新病害,在安徽大别山栝蒌生产区发生严重。本研究采用菌丝生长速率法测试了12个代表性栝蒌叶枯病菌菌株对4种常用杀菌剂的敏感性。结果表明,栝蒌叶枯病菌对咪鲜胺敏感性较高,其EC50为0.013 0~0.219μg/mL;代森锰锌和百菌清对栝蒌叶枯病菌均有一定的抑制作用,但各菌株对代森锰锌和百菌清的敏感性差异较大,其EC50分别为0.997~95.64μg/mL和1.66~185.84μg/mL;多菌灵对栝蒌叶枯病菌的菌丝生长抑制作用较差。

A new leaf blight disease caused by Alternaria alternata was observed and reported on Trichosanthes kirilowii Maxim.in the southwest region of Anhui Province,which has become a serious disease limiting snakegourd fruit production in recent years.12 representative strains of A.alternata were isolated from T.kirilowii plants in different farms,and the sensitivities of 12 strains to 4 fungicides were measured by the mycelial growth rate method.The results showed that the isolates were sensitive to prochloraz with the EC50 values of 0.013 0-0.219μg/mL.Mancozeb and chlorothalonil had certain inhibitory effects on the growth of A.alternata,with the EC50 values of 0.997-95.64μg/mL and1.66-185.84μg/mL,respectively,while there were variations in sensitivities to the same fungicide among isolates from different areas.Moreover,the isolates were less sensitive to carbendazim.