Balsam fir is the most susceptible host to outbreaks of the spruce budworm; annual defoliation of current-year growth for 5 to 8 years will kill the host tree.
Annual defoliation of current-year growth for 5 to 8 years will kill the host tree. Balsam fir is the most susceptible host to outbreaks of the spruce budworm.
Balsam fir is the most susceptible host to outbreaks of the spruce budworm. Annual defoliation of current-year growth for 5 to 8 years will kill the host tree.
Balsam fir is the most susceptible host to outbreaks of the spruce budworm. Annual defoliation of current-year growth for 5 to 8 years will kill the host tree.