Sooty Mold:

This is a black fungus that grows on the sticky honeydew deposited on the foliage by various sucking insects such as aphids, scale and mealybugs. The mold is unattractive and may interfere with photosynthesis by blocking sunlight.

Control:

Treat insects causing sticky honeydew. Wipe off affected leaves with a damp cloth.

Sooty Mold

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