Rough bark of alder
Damage, symptoms and biology
The presence of this fungus appears to have little effect on the health or productivity of alder trees. Young trees are occasionally deformed and/or stunted when numerous cankers are present.
The infection of alder by Didymosphaeria oregonensis is thought to be restricted to young trees, and the cankers cease to grow after the bark thickens with age. The rough bark remains, however, on the trunks of mature trees.
Canadian Forest Service Publications
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