Black spot is a common fungal disease causing dark brown to black leaf spots on the upper surfaces.
Black spot is caused by fungus. Dark-brown to black leaf spots develop on the upper leaves, which eventually become yellow and drop.
Black spot can be distinguished from other leaf spot diseases by its fringed edges and dark black colour. Raised, reddish-purple spots may also appear on the plant. Warm, humid conditions favour its germination and growth.
Black spot disease is caused by variety of fungi:
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