Abstract
Camellia japonica is a native tree species with high economic value that is widely cultivated in southern China. In recent years, canker disease has been observed in camellia plantations in Zhejiang Province, China, with the disease incidence rate in some plantations exceeding 20%. Canker disease severely affects the trunks and branches of C. japonica in China, but the causal agent has not yet been identified. In this study, the pathogen was isolated from infected C. japonica tissues through a conventional tissue isolation approach. Species identification was conducted using morphological methods combined with multilocus phylogenetic analysis. Pathogenicity was tested based on Koch’s postulates. The results showed that the pathogen could be isolated from the diseased bark of C. japonica ‘Hongluzhen’. The pathogen was identified as Nectria pseudotrichia based on morphological, cultural, and molecular traits. The inoculation of the pathogen into C. japonica ‘Hongluzhen’ caused necrotic lesions on healthy seedlings, and the fungus N. pseudotrichia could be re-isolated from such lesions. Therefore, N. pseudotrichia is the causal agent of canker disease affecting C. japonica in China.
Highlights
Camellia Canker Disease in China.Camellia japonica L. is an evergreen shrub or tree in the family Theaceae that is native toChina, South Korea, and Japan [1,2]
N. pseudotrichia is the causal agent of canker disease affecting C. japonica in China
This study aims to estimate the incidence rate of canker disease in two camellia plantations in Zhejiang Province, to isolate the pathogen from infected C. japonica tissues through a conventional tissue isolation approach, to identify the fungal species that are associated with camellia canker disease in China based on morphology combined with multilocus phylogenetic analysis, and to determine the pathogenicity of Nectria pseudotrichia
Summary
Camellia Canker Disease in China.Camellia japonica L. is an evergreen shrub or tree in the family Theaceae that is native toChina, South Korea, and Japan [1,2]. Camellia japonica L. is an evergreen shrub or tree in the family Theaceae that is native to. South Korea, and Japan [1,2]. Over the last 200 years, C. japonica has been gradually introduced into Europe, the Americas, and Oceania, and has become a popular garden plant in most warm-temperate regions of the world [2,3]. C. japonica is a multipurpose tree species with high ornamental, economic, and medicinal value. C. japonica is popular due to its bright color and beautiful flowers, which are responsible for its high ornamental value. The content of unsaturated fatty acids, such as oleic acid, in the seeds of C. japonica accounts for more than 90% of the total fatty acid content, giving this species high economic value [4]
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