In this study the durability following of five woody species
Zelkova carpinifolia (pall). Koch
Ulmus glabra Huds.
Carpinus betuius L.
Acer trauvetteri medv.
Pterocarya fraxinfolia (poir)
were studied against coriolus versicolor under laboratory conditions using kolleshalle according to din 52176 standards.
Three Trees from each species were cut in spring. The fungus was isolated and cultured on malt extract agar and pure cultures were obtained. Heart wood was cut from the logs. After drying, into 1.5×5 cm cubes.
The weight of the samples were measured at 0% humidity and placed on the surface of agar (c. versicolor was grown) in kolle flasks. The flasks were kept for 4 months in an incubator at 22-25 and 70% humidity and weighed.
Separate sample were takon for the determination of extractive materials from the heart wood. The results were as fellows:
1- z. carpinifolia showed a reduction in weight of 2.19% Based on findly classification, it can be rated as highly durable wood.
2- U. glabra. c. betulus. A. trauvetteri. And p. froxinifolia with 41.69, 45.64, 53.05 and 43.08 percents reduction in weight were rated non durable.
3- The amount of extractive materials in wood of z. carpinifolia u. glatra, c. betulus, A. trauvetteri and p. praxinifolia respectively were 13.84, 4.51, 2.79, 3.88. and 4.11%.
4- There was no significant difference between the extractive materials and site location of growth of z. carpinifolia. U. glabra, and fraxinifolia species, but the difference was significant for A. trauvetteri and c. betulus.
5- There was a significant difference between durability and location for u. glabra, c. betulus and z. carpinifolia, but not for A. trauvetteri and p. fraxnifolia.
6- There was a negative correlation between decay and amount of exteractive material for all species except p. fraxinifolia.