Large Infection Center of Scleroderris Canker (European Race) in Quebec Province. G. Laflamme, Laurentian Forestry Centre, Canadian Forestry Service, 1055 du P.E.P.S., Sainte-Foy, Quebec, G1V 4C7 Canada. D. Lachance, Laurentian Forestry Centre, Canadian Forestry Service, 1055 du P.E.P.S., Sainte-Foy, Quebec, G1V 4C7 Canada. Plant Dis. 71:1041-1043. Accepted for publication 13 July 1987. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-1041.

Scleroderris canker was found in 163 plantations, primarily on red pine and occasionally on Scots pine, during a survey of 1,183 pine plantations in southwestern Quebec. The European race of Gremmeniella abietina was identified in 121 plantations and the North American race in 29. This is the second largest known outbreak of the European race in North America after that in New York State. Plantations varied in age from 6 to 24 yr; half of the diseased plantations were severely damaged. Both races were well mixed geographically, and no definite source of infection could be identified. The extensive presence of G. abietina (European race) in this region could not be explained. Jack pine was not affected by the disease.