Spatial patterns and factors influencing spruce budworm infestation in Eastern Canada forests

dc.contributor.advisorMacLean, David
dc.contributor.authorLi, Mingke
dc.description.abstractA spruce budworm (Choristoneura fumiferana Clem.; SBW) outbreak in Québec spread southward into New Brunswick in 2014. This thesis used spatial analyses of 5 years of SBW population data in northern New Brunswick and tree defoliation data in Québec to examine spatial patterns and factors influencing SBW infestation. Local previous-year SBW population level, proximity to outbreak hot-spots, and April degree-days were important in predicting SBW population levels in New Brunswick, although relationships were inconsistent across years. Models incorporating spatial stuctures [sic] explained 68–79% of the annual variance, and performed better than non-spatial models. A combined-year model with R [squared] = 0.53 consistently underestimated upcoming-year populations. Defoliation patterns quantified in 57 plots in Québec were clustered in 28-47% of cases, which had higher plot-level defoliation and higher deviations. Plot-level defoliation and basal area explained 80% of the variance in individual-tree-defoliation. The thesis contributed to efficient sampling allocation and insecticide treatment targeting infestation.
dc.description.copyright©Mingke Li, 2019
dc.format.extentxi, 129 pages
dc.identifier.otherThesis 10464
dc.publisherUniversity of New Brunswick
dc.subject.disciplineForestry and Environmental Management
dc.titleSpatial patterns and factors influencing spruce budworm infestation in Eastern Canada forests
dc.typemaster thesis and Environmental Management of Science in Forestry of New Brunswick


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