This is an information by Dr. rer. silv. Thomas Jung expert for Phytophthora, forest and tree diseases and nurseries
http://www.tree-diseases.com

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Phytophthora Picture Gallery - Alder dieback

Alder 18: Riparian common alder (A. glutinosa) with root and collar rot by P. alni; note that the infected root stock is no longer able to stabilize the riverbank and becomes eroded.

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Picture 18 of 24