DCNR Forester Bill Laubscher, center, demonstrates the application of insecticide around the base of hemlock trees.

DCNR Forester Bill Laubscher, center, demonstrates the application of insecticide around the base of hemlock trees for Penn State DuBois students. The work students assisted with is intended to protect the trees from the hemlock woolly adelgid, an invasive insect that poses a serious threat to Pennsylvania’s state tree.

Image: Steve Harmic