Abstract
The allotriploid Phytophthora x alni (Brasier & S.A. Kirk) Husson, Ioos & Marcais and its progenitors, the diploid P. uniformis (Brasier & S.A. Kirk) Husson, Ioos & Aguayo and the allotetraploid P. x multiformis (Brasier & S.A. Kirk) Husson, Ioos & Frey are the causal agents of alder decline in Europe. In June 2015, a dark, ca. 40 mm stem lesion was found on one out of 100 inspected Alnus glutinosa (L.) Gaertn seedlings in Mantyharju, Finland. Surface wood pieces from the lesion edges were plated onto malt agar (MEA). Cultures on carrot piece agar (CPA) showed appressed colony with woolly aerial mycelium. Oogonia (O mean 44.8 µm, n = 50) and oospores (O mean 40.0 µm, n = 50) developed after 7 days at 20 °C in the dark. They were commonly smooth walled and 49 out of 50 of the amphigynous antheridia were single celled. Sporangia (21.7 µm x 18.1 µm, n = 50) were produced on pea broth, with 2-day flooding with soil extract, and they were commonly unpapillate and obpyriform-ellipsoidal. DNA was extracted and t...
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