DESCRIPTION The adult greenhouse whitefly's size is 1/16th of an inch. They are found on the undersides of leaves and look like white specks with their powdery covering. The nymphs are less noticable, being smaller, flat and almost transparent. It is the wingless nymphs that are actually doing
the damage by sucking plant juices. Weakening and possibe stunting do not usually occur to a great extent except in the Gulf states and greenhouses where populations become large due to continual reproduction. Whiteflies can also excrete honeydew which can promote sooty mold. They also are known to spread some viruses.