Honeydew will often host a thin, black fungus called Sooty Mold . Other insects which leave behind honeydew include Scale and Whiteflies . These two insects, however, are easily distinguished by their physical characteristics. Visible insects . Look for visible insects clustered particularly on the undersides of the leaves.
Aphids are tiny insects, though easily visible.
They have pear-shaped bodies with long antennae and legs. They may or may not have wings. They come in various colors, including black, brown, green, red and pink. If your African Violet exhibits these symptoms, it probably has Aphids. Other Symptoms Leaves have a black fungus on them .