What causes black spots on orchid leaves?

Black spots on orchid leaves are anthracnose. The diseased branches need to be cut off and burned. Bacteria can be sprayed and treated. You can also take the plant out of the pot and soak it in a Tobrazin solution. After disinfection, plant it, pour water and place it in a cool place. Spray every few days to prevent recurrence. Anthracnose is mainly caused by environmental problems, and it is usually necessary to pay attention to ventilation and reduce moisture.

First, what is it?

Black spots on orchid leaves are usually caused by anthracnose. The disease initially produces black spots on the leaves, which are small at first and then gradually expand, eventually causing the leaves to dry up. As one of the common diseases, besides treatment methods, certain prevention and treatment methods are also needed.

How to treat it

1. Prune the diseased leaves: cut off all orchid leaves with black spots. Since anthracnose spreads easily, it is important to avoid the presence of diseased leaves. Do not casually throw away the cut diseased leaves; it is best to burn them together, so that they can be effectively disinfected.

2. Chemical sterilization: besides bacteria on the leaves, there may also be bacteria remaining in the orchid's growing medium. Spray treatment is needed, such as pasteurization. If the situation is serious, the plant needs to be taken out and soaked in a Tobrazin solution.

3. Replanting and care: a sterile orchid can be replanted in a new pot with new soil to avoid continued bacterial infection. After replanting, pour in water and place it in a cool, ventilated place. Do not spray water for a short time, as this is not conducive to wound healing. After spraying disinfectant every few days, it can be completely cured in about 20 days.

4. Follow-up prevention: orchid anthracnose is mostly caused by a harsh environment. It is necessary to strengthen the ventilation environment, avoid stagnant air, and also appropriately reduce humidity. Air humidity is the key to breeding bacteria, so a little desiccant can be placed indoors to reduce moisture.