• Wilson, Louis F.
  USDA Forest Service
  

The yellow-headed spruce sawfly (Pikonema alaskensis (Rohwer)) is a native insect destructive to several species of spruce in the United States and Canada. It occurs from Maine and New Brunswick west through the Central Canadian Provinces and the Lake States to Wyoming and Idaho and north to British Columbia and Alaska. This sawfly is commonly found on planted and open-growing trees; most natural and closed stands are typically free from attack. Shelterbelts, windbreaks, shade trees and ornamentals, nursery stock, young plantations, and naturally regenerated cutover areas may be damaged by the larvae.