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Effects of Insect Defoliation on Growth and Foliar Nutrients of Young Balsam Fir

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Intact healthy needles from young balsam fir (Abies balsamea (L.) Mill.) trees with various defoliation histories showed increased weights and concentrations of nitrogen, phosphorus, potassium, calcium, and magnesium as compared to similar needles from shoots that were not defoliated. During the first year of defoliation of the current year's foliage, a concomitant reduction in volume growth occurred. A loss of two age classes of needles resulted in about 50 percent reduction of the projected stem volume growth. Practical implications of the findings are discussed. Forest Sci. 26:665-673.

Keywords: Abies balsamea; spruce budworm defoliation; tree response

Document Type: Journal Article

Affiliations: Maritimes Forest Research Centre, Canadian Forestry Service, Department of the Environment, P.O. Box 4000, Fredericton, N.B. Canada

Publication date: December 1, 1980

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