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P. alni in alder forest, Germany, with T. Jung

P. alni in alder forest, Germany, with T. Jung

P. alni in riparian alder, Germany

P. alni in riparian alder, Germany

P. alni subsp alni sporangium

Non-papillate, non caducous sporangium, photo used with permission from Q-bank

P. alni in alder, Illwald, France

P. alni in alder, Illwald, France

P. alni symptoms on European Alder

Mature, riparian common alder (A. glutinosa) stand with high impact of Phytophthora root and collar rot.

P. alni lesion in alder, Illwald, France

P. alni lesion in alder, Illwald, France

P. alni oogonia subspecies and variants

Fig. 40. P. alni subsp. uniformis. Fig. 41.  P. alni subsp. multiformis German variant. Fig. 42. P. alni subsp. alni. Fig. 43. 

P. alni in riparian alder, Scotland

P. alni in riparian alder, Scotland

P. alni oogonium

Bullate oogonium of P. alni (German variant) with oospore and amphigynous antheridium.

P. alni symptoms on European Alder

Mature, riparian common alder (A. glutinosa) stand heavily impacted by root and collar rot caused by P. alni

P. alni oogonia

Smooth-walled oogonium of P. alni (Swedish variant) with oospore and amphigynous antheridium.

P. alni basal canker on European Alder

P. alni basal canker on European Alder (Alnus glutinosa)

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