According to Dr. Donald Dahlsten of the UC Berkeley Center for Biological Control , biological controls may soon be ready. Dr. Dahlsten and his colleagues in Australia are in the process of capturing host specific parasitoid wasps, breeding them, and assessing their impact on the environment for potential release this Spring. Dr. Dahlsten has had success with other biological psyllid controls in the past, most notably the Eugenia psyllid and the Blue Gum Psyllid. While control methods are being developed, there are certain cultural practices that will optimize tree health and help infested trees weather the infestation. Prune trees only when needed, and only during the months of December and January.
Fresh wounds attract wood boring beetles.
By pruning when beetle population and activities are at their lowest, chances of infestation are greatly minimized. Do not prune trees to minimize insect levels. By pruning, you are reducing the food making abilities of the tree, further weakening the specimen. Deep water, preferably using a drip emitter type system. This will ensure the tree has an adequate supply of water, especially during periods of drought.