Pest description and crop damage Colonies form in groups on needles. An extensive infestation yellows the tree and promotes sooty mold.
See "Pine" in:
Christmas Tree Plantation Pests
Biological Control of Nursery Pests
Chemical Control of Nursery Pests
For more information
Johnson, W.T. and H.H. Lyon (1991), Insects That Feed on Trees and Shrubs, 2nd ed., Cornell University Press (p. 84).