Abstract
Panax ginseng (Asian ginseng) and Panax quinquefolius (American ginseng) are two important species of genus Panax used commercially in China. The main species of Colletotrichum on P. ginseng have been previously investigated, but Colletotrichum on P. quinquefolius has not been verified in China. In June 2020, August 2021 and September 2022, leaf spots on P. quinquefolius were found in Jilin Province, northeastern China. Eighty Colletotrichum strains were isolated from the diseased leaves and were identified as Colletotrichum panacicola based on morphology and molecular characterization. After inoculation of these strains on detached or attached American ginseng leaves, leaf spots developed after 4 days on detached leaves and after 6 days on attached leaves. A fungus with the same morphology and spores as the inoculated strain was re-isolated from the lesions. This is the first report of leaf spot disease of P. quinquefolius caused by C. panacicola in northeastern China. We also tested this pathogen on 13 other plants and found that it can cause severe symptoms on apricot and crab apple, both members of Rosaceae. This study confirms a new location and additional host range of this fungus and highlights that it is a potential threat to P. quinquefolius cultivation in China.
Published Version
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