Whiteflies

Whiteflies are common pests of greenhouse vegetables and flowers.  In warmer climates, they attack citrus and many ornamentals.  Nymphs--found on lower leaf surfaces--are oval, flat insects with short, sucking beaks.  Sweet, sticky honeydew dropped by nymphs attracts ants and may lead to the growth of sooty mold.

Carefully inspect purchased plants grown in greenhouses.  Combat with thorough coverage of insecticides labeled for use in controlling white flies.