A common leaf disease of Cymbidium species is found in Fujian, Jiangsu, Zhejiang, Shanghai and Nanjing.
Symptoms: The disease mainly damages the leaves. At the beginning, brown dots appeared on the leaves, rapidly expanding into a round color, wider and lighter brown in the middle. Both sides of the leaf had small yellowish protuberances that occurred at the upper, middle and base of the leaves, while the middle and base were more. Unlike orchid anthrax, the lesions are large, often spanning the leaf surface, blocking upper and lower moisture, nutrient transmission, and causing the leaves above the lesion to die. The hazard is heavier than that of anthrax.
Pathogen and pathogenesis: Cylindrosporium sp. The pathogens overwinter with mycelium or conidia. Conidia can tolerate low temperatures of 0 degrees Celsius for 20 days without reducing the sprouting power. When environmental conditions are appropriate, it is spread by rain and water droplets when watering. When the soil is compacted, the basin is too dense, and the ventilation and light transmission are poor, when the leaves are injured, it is easy to cause the disease. Among orchids, Chillran, Chunlan, Jianlan and Cymbidium are susceptible to disease, and the infection is most severe with Cymbidium.
Control measures:
1, timely removal of disease, dead leaves, reduce the source of infection. Cut off the lesions in the upper and middle parts in time and try to keep the green part.
2. Spraying 1% Bordeaux mixture twice a month can prevent this disease. Spray 75% chlorothalonil 500 times during onset.
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