Googled and found this.......Control: Woolly whitefly can be controlled at economically acceptable levels by natural enemies without using chemical control. At least four species of tiny parasitic wasps (harmless to people) prey on the immature stages of woolly whitefly. One or more of these wasps is likely to be established in all areas where woolly whitefly occurs. The population of parasitic wasps will lag behind the rapid buildup of the whiteflies during the summer months. However, by fall their impact should be noticeable as, by then, they often parasitize nearly all of the immature whiteflies in a colony.
Unfortunately, ants, which collect honeydew, disrupt the natural control system and must be controlled to keep the system in balance. Control ants by preventing their access to the tree. First, eliminate alternative pathways onto the tree by pruning all branches so that none touch the ground, adjacent plants or structures. Then prevent access via the trunk by banding it with a sticky nontoxic product such as tanglefoot, twelve inches or so above the ground. To prevent staining of the tree, wrap the trunk with a strip of stiff paper, and apply the tanglefoot to the paper.
In situations involving only minor infestations, simply removing the infested leaves is a very effective strategy. A strong blast from a garden hose directed at the undersides of the leaves will also dislodge adults and some immatures. This has the added benefit of washing off the honeydew and some sooty mold.
Pesticides are not recommended for use against the wooly whitefly. Pesticide use may disrupt the balance of natural predators and pest, and cause a resurgence greater than the original outbreak
Santa Barbara County
Agricultural Commissioner's Office
263 Camino del Remedio
Santa Barbara CA 93110
(805)681-5600