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 . This is probably Sooty Mold , which finds a host in the honeydew left behind by Aphids and other insects. When Sooty Mold is present, the upperside of the leaves will be covered with tiny, dark speckles.
Leaves curl up on the edge .
Leaves pale . They appear yellow or grayish in color. Leaves wilt . They may appear translucent brown with a soft, jelly-like consistency. Flowers are deformed or twisted .