1 Department of Biology, Concordia University, Montreal, QC H4B 1R2, Canada.
2 Ecological Research Group in MRC Abitibi (GREMA), Institute for Forest, Université du Québec en Abitibi-Témiscamingue, Amos, QC J9T 2L8, Canada.
3 Grupo de Análisis y Planificación del Medio Natural, Universidad de Huelva, Dr. Cantero Cuadrado 6, 21004 Huelva, Spain.
4 Département des Sciences Biologiques, Université du Québec à Montréal, Montreal, QC H2X 1Y4, Canada.

In managed boreal forests, both plantations and natural regeneration are used to re-establish a cohort of conifer trees following harvest or disturbance. Young trees in open plantations generally grow more rapidly than under forest canopies, but more rapid growth could be compromised by greater insect damage. We compared insect damage on white spruce (Picea glauca (Moench) Voss, Pinaceae) growing in plantations with naturally regenerated trees under mature forest canopies in boreal forests (Québec, Canada). We selected ten sites in the naturally regenerated forest and in small, multispecies plantations and sampled ten young trees of 2.5-3 m (per site) in late summer 2020 and again in early and late summer 2021. We compared overall rates of herbivory, galls (adelgids), damage by the spruce budworm (Choristoneura fumiferana, Clemens), and defoliation from sawflies. Overall, insect herbivory damage remained at similarly low levels in both habitats; an average of 9.3% of expanding shoots were damaged on forest trees and 7.7% in plantation trees. Spruce budworm damage increased from 2020 to 2021 and remained higher in under-canopy trees, but damage rates were negligible at this early stage of the outbreak (1.5% in forest vs. 0.78% of buds damaged on plantation trees). While damage due to galls was higher in plantations, the overall low level of damage likely does not pose a significant impact on the growth or mortality of young trees.