Subjects affecting European alder (Alnus glutinosa)
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Image Subject Name Scientific Name Description
2110005 Phytophthora disease of alders Phytophthora alni 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.
2110009 Phytophthora disease of alders Phytophthora alni Common alder (A. glutinosa) in a non-flooded forest plantation with root and collar rot caused by P. alni.
2110010 Phytophthora disease of alders Phytophthora alni 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.
2110011 Phytophthora disease of alders Phytophthora alni 2-yr-old sprouts of of an 8-yr-old coppiced Alnus glutinosa showing wilting due to root and collar rot caused by P. alni.
5379792 red-belted fungus Fomitopsis pinicola

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