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What to Do About Black Spots on Phalaenopsis Leaves? Causes and Control Methods

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There are many causes of black spots on Phalaenopsis (moth orchid) leaves: if the black spots are caused by strong light, shade the plant promptly; if they are caused by a poor environment, move the plant to a clean environment; if they are caused by disease, remove the affected leaves and spray promptly; if they are caused by temperatures that are too low, raise the temperature to 20-24°C.

1. Provide appropriate shade

Cause: Phalaenopsis cannot tolerate strong light. If the light is too intense, it will scorch the leaf surface, causing partial burns and black spots.

Solution: Place it in a spot with diffused light, or provide appropriate shading during the harshest sunlight hours.

2. Clean the environment

Cause: In environments with a lot of coal smoke, orchids are prone to damage from soot and dust, developing black spots.

Solution: The place where Phalaenopsis is grown should have fresh air and be clean and tidy; do not grow it in places with excessive dust or smoke.

3. Spray promptly

Cause: Black spots on the plant are very likely due to a pest or disease infection. Only by promptly removing the source of the disease can the plant grow better.

Solution: When there are many leaves, you can cut off the spotted leaves to prevent cross-infection, and at the same time spray the plant with agents such as 80% mancozeb or 80% Daconil at 800 times dilution, maintaining this 2-3 times per month.

4. Raise the temperature

Cause: Phalaenopsis is a tropical plant, so when the temperature is too low it will produce withered leaves or black spots.

Solution: Keep the room temperature at 20-24°C; in winter it must not fall below 10°C, otherwise growth will stop.

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