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Signs of damage
Here are the main signs of black spot disease:
- Round, black spots about ½ inch (1.3 cm) in diameter with fringe margins.
- The spots are present on the upper side of the leaves.
- The leaf tissue surrounding the spot is turning yellow.
- Lower leaves are infected first.
- Infected leaves fall off early.
How to prevent
Black spot disease spreads from drips and splashes in moist conditions. Your plants are especially prone to it if the leaves stay wet for a long time. In the case of indoor plants, you can take these steps to prevent black spots:
- Water from the bottom of the plant to keep the leaves dry.
- Water early in the day to let the leaves dry.
- Ensure good ventilation of foliage.
- Do not mist the leaves unless it’s a requirement for your plant.
In the case of outdoor plants, here are some additional measures:
- Keep the base of the tree clean of fallen infected leaves by raking.
- Prune the lower canopy that rarely dries out and leave the upper one intact.
- Plant new greenies apart from each other so they don’t touch when mature.
It’s possible to recover from black spot disease. Prune all infected leaves, especially those that are already yellowing. Disinfect the shears after cutting each leaf to prevent the spread of disease. Spray the leaves with neem oil once every few weeks or apply fungicides.
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