Whiteflies Whitefly adult and nymphs 2000. Ralph E. Berry, Department of Entomology, Oregon State Univiversity, Corvallis, Oregon.
Nymphs are flat and oval and appear glued to the lower leaf surface.
Nymphs also are covered with a powdery white, wax-like material. The injury caused by adults and nymphs is similar to that caused by aphids in that whiteflies suck plant juices and excrete honeydew that gives the plant a sticky appearance. Feeding injury causes stunting, distorted leaves, and weak appearing plants. Whiteflies seldom require control in potatoes in the northwest. Requires Adobe Acrobat Reader 3.x or above to print.