A Survey to Evaluate Crown Condition of Forest, Roadside, and Urban Maple Trees in Ontario, 1987-1995
Surveys of sugar maple trees, conducted in Ontario between 1987 and 1995, showed a general improvement in crown condition after 1990. Plots on the shallow soils of the Precambrian shield in central Ontario showed the highest levels of crown dieback in all years. This area was also defoliated at moderate-to-severe levels in 1988. Dieback levels on undefoliated plots were high in 1987-1988, but plots improved after 1988. Defoliated plots showed no improvement, and dieback remained high through 1995. Crown dieback was lower in forest and urban situations than at roadside plots. Roadside plots showed high levels of dieback and should be considered poor indicators of forest condition. Pest damage was recorded on all plot types. Sugar maple in both urban and roadside locations had a higher incidence of stem defects, stem canker, and stem insect damage than trees in forest plots. Root rots were most prevalent at roadside locations. Stem cankers, stem defects, and root rot were most common in the northern forest plots. North. J. Appl. For. 15(3): 141-145.
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Document Type: Journal Article
Affiliations: Canadian Forest Service, 1219 Queen St., P.O. Box 490, Sault Ste. Marie, Ontario, Canada P6A 5M7
Publication date: 1998-09-01
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