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Diseases - Root and Butt / Root and Stem Diseases

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Image	Subject Name	Scientific Name	Description
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.
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.