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The Nujiang Dry-hot Valley region in Yunnan is an ideal area for the cultivation of Arabica coffee (Coffea arabica L.). However, the continuous occurrence of coffee leaf diseases has a significant impact on the health, yield and quality of coffee trees, causing considerable losses to local agricultural production. To effectively manage the diseases, this study focused on the isolation and identification of the pathogens associated with coffee leaf diseases in the Nujiang Dry-hot Valley region. Typical diseased leaf samples were collected from various coffee plantations, and through pathogen isolation, purification, verification using Koch’s postulates, morphological observation and ITS gene sequence analysis. Seven pathogenic strains, Lu 11-2, Lu 9-1, Xin 5-2, Xin 7-5, Xin 8-2, Xin 15-2 and Lu 23-1, were identified. Lu 11-2, Lu 9-1, Xin 5-2 and Xin 7-5 were identified as Alternaria sp., Xin 15-2 and Lu 23-1 were identified as Colletotrichum sp., and Xin 8-2 was identified as Pestalotiopsis sp. The primary pathogens causing coffee leaf diseases in this region could be categorized into three types, Alternaria sp., Pestalotiopsis sp. and Colletotrichum sp.. Specifically, Alternaria sp. and Pestalotiopsis sp. were the primary pathogens responsible for coffee leaf spot disease, while Colletotrichum sp. was the causative agent of coffee anthracnose disease. The findings of this study would not only provide a scientific basis for a deeper understanding of the types of coffee leaf diseases in the Nujiang Dry-hot Valley region of Yunnan but also offer theoretical support for effective disease management in the area. This research plays a significant guiding role for local coffee cultivation and serves as a reference for disease control in coffee-growing regions elsewhere.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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