Pest description and crop damage Infested leaves become disfigured with yellow spots. Scale also feed on bark, causing twig dieback. Eggs are laid in masses of cottony wax in late winter.
Chemical Control of Nursery Pests
Apply to control the immature crawler stage, usually in late spring to early summer. Scout for crawlers and gather life history data. Oils are effective early to late spring.
For more information
Johnson, W.T. and H.H. Lyon (1991), Insects That Feed on Trees and Shrubs, 2nd ed., Cornell University Press (p. 334).