During the last decade examined samples from diseased trees in Zagreb urban areas and research results revealed the important role of several bark pathogenic fungi. Some of them were found as weak parasites which occur on predisposed trees, and some as causal agents of dieback. The most frequent fungi turned out to be Sphaeropsis sapinea and Apiognomonia veneta. Pine trees have been heavily attacked by 5. sapinea and plane trees differently infected by A. veneta in the last ten years. The experienceand up-to-day knowledge on these two fungi are presented and discussed in this paper.
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