Phytophthora alni Brasier & Kirk, 2004
Peronospora arborescens (Berkeley) de Bary, 1863
Chromista, Oomycota, Oomycetes, Peronosporales
the disease usually starts at the roots and root collar, and extends from there in a few years up into the crown; it manifests itself by large brown bleeding bark lesions, later in a reduction of the foliage and branch die-back.
Alnus cordata, glutinosa, incana.
The disease, that first appeared in 1993, in southern England, has spread in a short while all over Europe and causes massive deaths of alder trees, especially along riverbanks,
Abras, Fassotte, Chandelier & Cavelier (2008a), Černý & Strnadová (2010a), Klenke & Scholler (2015a), Mułenko, Piątek, Wołczańska ao (2010a).