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This research aimed to identify a pathogenic fungus of the brown spot disease in the leaves of Cycas and screen for its chemical control agents, which provides a theoretical basis for the protection of Cycas. The pathogenic fungus was isolated from the lesion spots in some Cycas leaves. The pathogenicity of the fungus was confirmed by isolating and purifying the infected leaf tissues and reintroduced to the healthy leaves of Cycas diannanensis following Koch’s postulates. Morphological identification of the pathogenic fungus was conducted. To further confirm the identification, a phylogenetic tree was constructed using eight gene sequences: SSU, LSU, GAPDH, tef1, rpb2, Alt, OPA10-2 and ITS. Effective chemical control agents were screened from seven chemical agents by inhibition assay in vitro. Phylogenetic analyses showed that this pathogen was Alternaria burnsii. Among the tested chemical agents, the most effective inhibition was fluoxastrobin, which displayed 73.48% inhibition rate at a concentration of 0.67 mg/L.
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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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