A Virus Disease and Introduced Parasites as Factors Controlling the European Spruce Sawfly, Diprion hercyniae (Htg.), in Central New Brunswick

Publisher Website
Google Scholar
Abstract
An outbreak of the European spruce sawfly, Diprion hercyniae (Htg.), was discovered in the Gaspé Peninsula in 1930. By 1938, heavy infestations had developed west of the Gaspé Peninsula in Quebec, throughout New Brunswick and northern Maine, and in parts of Vermont and New Hampshire. Moderate to light infestations occurred through all other parts of the spruce forests of this region and extended from Nova Scotia, to the north shore of the St. Lawrence River, and west to Ontario.