Nuculaspis californica
See:
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:
Christmas Tree Plantation Pests
Management-biological control
See:
Biological Control of Nursery Pests
Management-chemical control
See:
Chemical Control of Nursery Pests
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).