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After the gentian violet method found orchids suffering from melasma, I should immediately remove the affected area with gentian violet (applicator area is slightly larger than the lesions), and the plaques will no longer expand and heal within a few days. This can preserve the leaves if It is also effective to use potassium permanganate saturation solution instead of gentian violet.
Food-cooling method Spraying edible vinegar on the leaves of flowers can eliminate black spot, powdery mildew, and leaf spot, and it can also prevent yellowing of camellia and rhododendron.
The leek method leaves the leek leaves soaked in clean water for 24 hours. The ratio of leek and water is generally 1:10. Watering flowers with leeks can prevent black spot and powdery mildew. Flowers that have been infected can reduce the disease. Water sprayed with leeks on the leaves of diseased flowers can also cure illnesses
Orchid is a kind of plant that “sees the leaves and wins the flowersâ€. When orchids are infected with melasma, the best cure is to remove the diseased leaves, but this will reduce the ornamental value and economic value of orchids (especially valuable species). The following three methods can effectively cure orchid black spot and do not have to remove the diseased leaves.