Host:European black alder (Alnus glutinosa
(L.) Gaertn.) Descriptor: Symptoms Description: Mature, riparian common alder (A. glutinosa) stand heavily impacted by root and collar rot caused by P. alni; surviving healthy alder in the center may indicate occurrence of resistance. Image type: Field Image location: Germany
Specimen in collection: No Specimen Condition: Identification Method:
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