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Diseases - Root and Butt / Root and Stem Diseases

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Image Subject Name Scientific Name Description
2110004 Phytophthora disease of alders Phytophthora alni Smooth-walled oogonium of P. alni (Swedish variant) with oospore and amphigynous antheridium.
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.
2110006 Phytophthora disease of alders Phytophthora alni Mature, riparian common alder (A. glutinosa) stand with high impact of Phytophthora root and collar rot.
2110007 Phytophthora disease of alders Phytophthora alni Alder plantation on former agricultural land; note infected grey alder (A. incana) with sparse, chlorotic and small-sized foliage.
2110012 Phytophthora disease of alders Phytophthora alni Root system of a 2-year-old nursery grown common alder (A. glutinosa) with necrotic lesions caused by P. alni.
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.
2110002 Phytophthora disease of alders Phytophthora alni Non-papillate sporangia of P. alni showing nested proliferation.
2110003 Phytophthora disease of alders Phytophthora alni Bullate oogonium of P. alni (German variant) with oospore and amphigynous antheridium.
2110008 Phytophthora disease of alders Phytophthora alni Grey alder (A. incana) with collar rot caused by P. alni; note the typical tarry spots at the outer bark and the tongue-shaped orange-brown necrosis of the inner bark.
2110001 Phytophthora disease of alders Phytophthora alni Mature common alder with collar rot caused by P. alni showing sparse, chlorotic and small-sized foliage.

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