The durability of the following five wood species, Zelkova carpinifolia, Ulmus glabra, Pterocarya fraxinifolia, Carpinius betulus and Acer laetum, were studied. Wood blocks were exposed to Coriolus versicolor under laboratory conditions according to DIN 52176 standard. After 16 weeks incubation the heart wood of Z carpinifolia showed 2,19 % weight loss, U glabra 41,69 %, C betulus 45,64 %, A laetum 53,03 % and P fraxinifolia 43,08 %. For finding relationship between durability and amount of wood extractives a regression analysis was carried out. The percentages of extractives (T20403-76 standard) were 13,84 % in Z carpinifolia, 4,51 % in U glabra, 2,74 % in C betulus, 3,88 % in A laetum and 4,11 % in P fraxinifolia. There was a negative correlation between decay and amount of extractives for all wood species except P fraxinifolia.

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