Pest description and crop damage Mature scale are almost circular, 0.06 inch in diameter, and yellowish brown to black. Young hatch in spring and summer. This insect attacks various species of pine, ponderosa most commonly, as well as Douglas-fir and hemlock.
See "Pine" in:
Apply to control crawler stage, usually in spring and summer.
For more information
Johnson, W.T. and H.H. Lyon (1991), Insects That Feed on Trees and Shrubs, 2nd ed., Cornell University Press (p. 100).