Pest description and crop damage Elongate, flat, white scale on leaves. Also attacks pine, fir, and occasionally cedar.
See "Spruce" in:
Apply to control the immature crawler stage usually in late spring to early summer. Scout for crawlers and gather life history data.
For more information
Johnson, W.T. and H.H. Lyon (1991), Insects That Feed on Trees and Shrubs, 2nd ed., Cornell University Press (p. 108).