Pest description and crop damage Larvae are bright orange; mature insects are tan. Adults lay eggs on needles from early to midsummer. First they mine the needle, then they sever the sheath.
See "Pine" in:
Christmas Tree Plantation 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. 38).