Defect Associated with Eutypella Canker of Maple

Abstract

Twenty-seven sugar maple (Acer saccharum Marsh.) trees bearing cankers caused by Eutypella parasitica Davidson and Lorenz were dissected to determine the extent of internal defect. In all cases, defect associated with the cankers was of a type that should be eliminated by cutting out the defective portion of the stem. Regression models presented show that internal defect length was a function of the external length of the canker, and that defect usually extended only a short distance beyond the canker margin. Logger aversion to harvesting cankered trees results in the loss of valuable sound wood. Key words: Acer saccharum, log defect, Eutypella parasitica, Eutypella canker, maple canker