Pest description and crop damage Scale covering is circular, white, and about 0.06 inch in diameter. Causes foliage to turn brown and twigs to die back.
Chemical Control of Nursery Pests
Apply spray when scale crawlers begin to appear (usually early June) and repeat again 3 to 4 weeks later (early to mid-July).
For more information
Johnson, W.T. and H.H. Lyon (1991), Insects That Feed on Trees and Shrubs, 2nd ed., Cornell University Press (p. 106).