Common diseases of Oncidium and their control methods

Oncidium leaf disease

When Oncidium is infected with mosaic disease, discontinuous light yellow spots will appear on the leaves at the beginning, and mosaic will occur. The lesions will then cause leaf necrosis, forming sunken brown necrotic spots on the leaves, and the leaves will gradually die.

Solution: Provide proper ventilation to avoid high temperature and high humidity environment; control watering and apply appropriate amount of phosphorus and potassium fertilizers; promptly remove diseased plants and leaves. In addition, spray pesticides in time when the disease occurs. You can choose Bordeaux mixture, methyl thiophanate solution, and benomyl, etc. Spray once every 7 to 10 days, and spray 2 to 3 times.

Oncidium gray mold

It mainly harms leaves and petals. Initially, small water-like spots appear on the petals, which then gradually expand into round brown spots. The lesions gradually expand in the form of spots. However, due to differences in varieties and maintenance conditions, the color depth of the spots will vary. In severe cases, the spots will expand and even cover the entire petals, causing the flowers to wither. When grown indoors, a gray mold layer will appear on the leaves and petals.

Solution: Ventilate in time, keep the environment dry, and avoid the generation of bacteria. Spray the pesticide in time when the disease occurs and take preventive measures.

Oncidium Anthracnose

When the disease occurs, small round spots of light yellow will appear on the leaf tips, which will then gradually expand into dark brown. Several adjacent lesions combine with each other, causing the entire leaf to die.

Solution: Pay attention to the watering method. Do not water directly from top to bottom. Water close to the soil. Do not have water accumulation in the center of the leaves. Keep the leaves dry at night. Avoid rain, provide appropriate light protection, and ventilate in time. Spray the medicine in time when the disease occurs to take preventive measures.