European pine sawfly (Neodiprion sertifer) is an insect pest of pines. It is a native of Europe and was first detected in Ohio in 1984.
As the larvae grow, they remain together and feed from the tip of a needle to the base. The larvae feed on older foliage and move from branch to branch as they strip the needles. Trees can be entirely defoliated.
For more information about this plant pest, see the CABI data sheet.