Host:European black alder (Alnus glutinosa
(L.) Gaertn.) Descriptor: Symptoms Description: Mature common alder (A. glutinosa) with collar rot by P. alni (note tarry spots at the outer bark) growing in a forest stand; introduction of the pathogen via alder plantation in the neighbourhood established with infested planting stock. Image type: Field Image location: Germany
Specimen in collection: No Specimen Condition: Identification Method:
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