关键词: 百合, 叶尖干枯病菌, 生物学特性, 杀菌剂, 敏感性

Abstract: In order to prevent and control the harm effects of leaf dieback of Lilium brownii var. viridulum，diseased plant samples were collected. Isolation and purification of the pathogen were conducted to identify the pathogen. Combining morphological method with molecular identifications of rDNA-ITS，LSU，TUB and RPB genes，the isolated strain was identified as Epicoccum sorghinum. Biological responses of the pathogen to different carbon source，nitrogen source，pH and light treatments also were studied. As a result，the most suitable carbon source was lactose，the most suitable nitrogen source was beef extract，the optimum temperature for the mycelium growth was 25 ℃，and the mycelium death temperature was 48 ℃，the optimum pH value for the mycelium growth was 6，the suitable light condition for the mycelium growth was 24 h. At the aspect of sensitivity to six fungicides，the results revealed that the inhibitory effects had significant differences on the mycelium growth of the pathogen. 50% Carbendazim water dispersible granules（WDG）had stronger inhibitory effect than the others，the concentration for 50% of maximal effect（EC50）was 0.011 mg · L-1，40% pyrimethanil suspending agent had the minimum inhibitory effect，with EC50 value 2.168 mg · L-1.

Key words: Lilium brownii var. viridulum, pathogen of leaf dieback, biological characteristics, fungicide；sensitivity