Whitefly, an insect that commonly feeds on citrus trees, certain other crops, and greenhouse plants. Whiteflies are generally 1/16 to 1/8 inch (1.6 to 3.2 mm) long. Their bodies are coated with a white, waxy powder. The greenhouse whitefly is a common pest in greenhouses worldwide. The sweetpotato whitefly, found in the southwestern United States and other warm parts of the world, transmits viral diseases to plants.
The greenhouse whitefly is Trialeurodes vaporariorum. The sweetpotato whitefly is Bemisia tobaci. Both belong to the Whitefly family, Aleyrodidae.A whitefly has a pale yellow body with white, translucent wings.