Pest description and crop damage Large, heavy-body moth. Large, brown to yellowish green, spiny larvae feed on needles and may defoliate during outbreak years. Requires 2 years to complete life cycle. Control not needed except in outbreak years.
See "Pine" in:
For more information
Johnson, W.T. and H.H. Lyon (1991), Insects That Feed on Trees and Shrubs, 2nd ed., Cornell University Press (p. 26).