 This study determined the pathogenic abilities and morphology of dioporthe eries isolates obtained in 2010-2012 from fruit trees in Poland through cross-tests on apple, pear, cherry and plum tree shoots. The results confirmed the pathogenic nature of de-eres in relation to fruit trees and showed that the morphological features of studied de-eres cultures were very similar, regardless of the isolate and host plant. This article was authored by Barbara Anna Abramczyk, Ava Dorda-Kroll, Ava Dorda-Zalewska and others.