At present there are five monitoring plots in Upper and Lower Austria, where the Alder Phytophthora was confirmed . Between 1997 and 1998 there was a slight decrease of the epidemics, whereas from 1998 to 1999 the percentage of diseased trees increased considerably. In addition, some cases of dieback of Common Alders with conspicuous long bark necroses on the south stem side are reported. This damage appeared after a frost event in April 1998.
