Studies on Anthracnose of Hemerocallis

Key words: 
• Hemerocallis /
• anthracnose /
• disease incidence /
• disease indexes /
• life history

Abstract: Anthracnose of Hemerocallisis caused by Colletitrichum liliacearum Ferr., its incidence is 85%-95% and disease indexes are 28-43. The pathogen could overwiter in the disease tissues ofHemerocallis. The primary infection of the disease occurres during late March and its gleization period lasts ten to fourteen days. The disease happens from April to November and flourishes from late May to June and from late August to September. The pathogen can infect leaves and scapes. There are brown spots on the diseased leaves which would die under the serious infection. High rainfall,long rain duration, warm and moist conditions are favourable to the infection of the pathogen. The pathogen grows best on PDA medium. The suitable temperature and PH values for the growth of mycelian are 20-30℃ and 3-10 respectively, and the optimal 25℃ and 6. The suitable temperature for the germination of conidium is 20-30℃. The killing conditions of conidium are at 50℃ for 10 minutes. The results of chemical control in laboratory indicated that 0.050 percent thiram, 0.075 percent chlorothalonil, 0.020 percent tricyclazole and 0.050 percent mancozeb in solution are effective fungicides for this disease.