IMPACT OF FOREST PESTS AND FIRE ON STAND GROWTH AND TIMBER YIELD - IMPLICATIONS FOR FOREST MANAGEMENT PLANNING

Impact of forest pests and fire on stand growth and timber yield is reviewed, with emphasis on spruce budworm (Choristoneura fumiferana (Clem.)). Sustainable harvest may be reduced by up to 60% by a severe spruce budworm outbreak and up to 40% by a 1% per annum loss to fire. Serious overestimation of future timber supply can therefore result from the failure to allow for catastrophic or continual small losses. Current efforts in New Brunswick to explicitly incorporate effects of spruce budworm defoliation into forest management planning are described, including research studies into protection planning and delivery, damage detection, and defoliation-based growth forecasting. -from Author