| Summary: | In the forest ecosystems in Serbia five Armillaria species are present. Understanding differences in the pathogenicity of Armillaria species to the tree species is of a great importance for the foresters. The aim of study was to test susceptibility of eight forest tree species to attack of Armillaria mellea and A. ostoyae. The sticks of Hazel previously infected with mycelium of two Armillaria were placed next to the root collar of two years old seediling. In the period of eighteen months health status of tested seedlings was observed. Differences in susceptibility among tested tree species was observed, while there was no difference in the pathogenicity between Armillaria mellea and A. ostoyae. The most susceptible species were Serbian Spruce, Common Fir, Scots and Austrian Pine, following by Spruce and Douglas Fir, while more resistant were Pedunculate and Sessile oak.
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