Plants become weak and their leaves may drop. While the most common species known to feed on African Violets is yellow in color, they may also be brown or black. They have wings and suck the plant tissue and leave a light yellow on leaves and flowers. Because of their minute size, you may not see them unless you are using a magnifying glass. They love to snack on houseplants and leave honeydew behind.
Whiteflies multiply quickly and because they have wings, they can spread to nearby plants.
Look underneath leaves for this pest. When you bring a new plant home, isolate it for two to three weeks. If pests do show up, isolating it will help prevent the pest from spreading to other plants. Brett Schaefer from Schaefer Greenhouses Inc., in Aurora, Ill. believes that proper care can go along way toward preventing pests. Houseplants require some basic care to remain healthy and vigorous.