I have a whitefly infestation in my flower beds and yard. I first tried sprayings with Neem, then oils, and finally with Malathion. I would have had the same success if I had sprayed with Pixie dust. What can I do? Truly, I followed label instructions with each application.
Washington County Oregon
Very little is known at this time about how damaging ash whitefly might be in Oregon or what sort of management may be needed. Treatment, if needed, should only be applied if infested leaves are found because the susceptible targets are the small oval youngsters.
This webpage (late 2015) for commercial growers has some background information and images of infested leaves: http://oregonstate.edu/dept/nurspest/Ash_whitefly.html