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Disease Note.

First Report of Butternut Canker in Ontario. C. N. Davis, Forestry Canada, Ontario Region, Box 490, Sault Ste. Marie, Ontario P6A 5M7, Canada. D. T. Myren, and E. J. Czerwinski. Forestry Canada, Ontario Region, Box 490, Sault Ste. Marie, Ontario P6A 5M7, Canada. Plant Dis. 76:972. Accepted for publication 20 April 1992. Copyright 1992 The American Phytopathological Society. DOI: 10.1094/PD-76-0972A.

Sirococcus clavigignenti-juglandacearum Nair, Kostichka, & Kuntz, the cause of butternut canker (1), was isolated from cankers on samples of butternut (Juglans cinerea L.) collected in Ontario during the summer of 1991 and submitted to the Great Lakes Forestry Centre of Forestry Canada, Ontario Region, by a field technician with the center's Forest Insect and Disease Survey unit. The technician reported that cankers, decline, and mortality were common on butternut throughout the southwestern region of the province. The collection from which the fungus was isolated was made in Ipperwash Provincial Park (lat. 45 II' N, long. 8151' W), located on southern Lake Huron. A culture of the fungus (SSMF 915-0882) has been retained in the Ontario Region collection housed at the Great Lakes Forestry Centre in Sault Ste. Marie. This is the first report of S. clavigignenti-juglandacearum in Canada, although a collection was made recently in Quebec (G. Laflamme, personal communication).
Reference: (I) V. M. G. Nair et al. Mycologia 71:641,1979.