Fungal pathogens of American ginseng (Panax quinquefolium) in British Columbia
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| Authors: | Punja, ZK |
| Year: | 1997 |
| Journal: | Canadian Journal of Plant Pathology-Revue Canadienne de Phytopathologie 19: 301-306 |
| Title: | Fungal pathogens of American ginseng (Panax quinquefolium) in British Columbia |
| Abstract: | Major fungal pathogens of American ginseng (Panax quinquefolium) in British Columbia were identified. Isolations were made from roots (235 samples) and leaves (25 samples) collected from ginseng-growing gardens in the Okanagan-Kootenay and Thompson-Cariboo regions during 1992-1996. The fungi recovered from damped-off 1- to 2-year old seedlings and from decayed mature roots were Pythium ultimum (35.6% of total isolates), species of Fusarium (30.5% frequency) (primarily F. solani, F. oxysporum, F. avenaceum, and F. equiseti), Rhizoctonia solani AG 4 (19.6% frequency), and Cylindrocarpon destructans (9.8% frequency). The fungi recovered from diseased leaf and petiole tissues were Phytophthora cactorum, Alternaria panax, A. alternata, and Botrytis cinerea. When tested in vitro, P. ultimum and F. solani were the most pathogenic to seedling roots, followed by R. solani and P. cactorum. On detached leaves, the most pathogenic fungi were P. cactorum, B. cinerea, and A. alternata, followed by A. panax and R. solani. The results of this study show the incidence, distribution, species identity, and pathogenicity of some of the commonly encountered fungi causing diseases of ginseng in British Columbia. |
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