Abstract:

The purpose of the research was to confirm the species and the major biological characteristics of the pathogen of anthracnose on garlic bolt. One anthracnose was isolated from the rotted bolts of garlic in XinXiang, Henan Province. Based on its morphologic characters, cultural characteristics and pathogenicity, the pathogen was identified as Colletotrichum gloeosporioides (Penz.) Sacc.. The temperature for the mycelial growth ranged from 10 to 35℃, with the optimum at 25℃. The suitable pH ranged from 3 to7, with the optimum at 7. For the conidial germination, the temperature ranged from 10 to 40℃, with the optimum at 30℃. The suitable pH ranged from 4 to 7, with the optimum at 6. When relative humidity (RH) reached 100%, the percentage of conidial germination was highest, but the conidium couldn’t germinate at lower than 90% RH. Alternation of light and darkness was the best for mycelial growth, and darkness was favorable for conidial germination. This is the first report of anthracnose caused by Colletotrichum gloeosporioides on garlic bolt in China.