The Influence of Forest and Stand Conditions on Spruce Budworm Defoliation in New Brunswick, Canada
The species composition of stands and surrounding forest have been suggested as important factors influencing the amount of spruce budworm (Choristoneura fumiferana [Clem.]) defoliation and, consequently, budworm-induced growth loss and mortality. We measured spruce budworm defoliation from 1989–1993 in 40 spruce (Picea sp.) and balsam fir (Abies balsamea [L.] Mill.) stands in north-central New Brunswick, Canada, and evaluated the influence of surrounding forest type (softwood, mixedwood), species group (balsam fir, spruce), and site quality (wet/nutrient poor, moist/nutrient rich) on defoliation. Surrounding forest type had a significant effect on the amount of defoliation in white spruce (Picea glauca [Moench] Voss) stands; stands in softwood forests sustained 11% more (P = 0.0485) defoliation than those in mixedwood. There was evidence that hardwood species have to be within, rather than surrounding, a spruce-fir stand to significantly influence defoliation. Site quality had a significant effect (P = 0.0039) on balsam fir defoliation, with stands on moist/rich sites sustaining 19% more defoliation than those on wet/poor sites. In softwood forest, white spruce stands sustained an average of 16% more defoliation than red-black spruce (Picea rubens Sarg.-Picea mariana [Mill.] B.S.P.) stands. FOR. SCI. 49(5):657–667.
Keywords: Abies balsamea; Choristoneura fumiferana; Picea sp.; balsam fir; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; mixedwood; natural resource management; natural resources; site quality; softwood; spruce
Document Type: Miscellaneous
Affiliations: 1: Forestry Officer Natural Resources Canada, Canadian Forest Service, Atlantic Forestry Centre, P.O. Box 4000 Fredericton, N.B., Canada, E3B 5P7, Phone: 506-451-6096; Fax: 506-452-3525 firstname.lastname@example.org 2: Dean Faculty of Forestry and Environmental Management, University of New Brunswick, P.O. Box 44555 Fredericton, N.B., Canada, E3B 5A3, email@example.com
Publication date: October 1, 2003
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