Differential defoliation and mortality of white spruce and balsam fir by Eastern spruce budworm

White spruce (Picea glauca) and Balsam fir (Abies balsamea) tree mortality data and tree characteristics recorded in July 2019 following an Eastern spruce budworm outbreak detected at two sites in northern Wisconsin, USA in 2014. These data were collected at the individual tree level, and include tree status, tree diameter at breast height (cm) and canopy class.