The maps of spruce budworm (Choristoneura fumiferana Clem.) defoliation presented cover the period from 1967 to 1981. A map showing areas of dead and dying trees, the effect of successive years of defoliation is also included. Information contained in this report was extracted from Provincial, Federal, and State Government and Industry files. The current spruce budworm infestation plaguing the spruce-fir forest of eastern North America is the most widespread this century.