The Decay Resistance of Cuperssus Sempervirens against White Rot

In this study, the influence of fungus (Coriolus Versicolor) on the durability of Cuperssus (Cuperssus Sempervirens) in a natural state by the use of Kolleschale s method and according to DIN 52176 and BS 838 standards was investiguated. For this purpose, the Neirang region with an altitude of 40 meters above the sea level in Nowshahr area was selected and three trees were randomly selected and cut down. For each tree one piece with 1.3 meters long from one meter above the ground level was cut, and these speciments were taken to the Chaloos Azad university labrotory in order for their mechanical and weight loss properties to be investigated. The speciments were contaminated with cultured fungus for fourteen weeks (in a condition of 25 c and 75% relative humidity). After this period, the weight loss, compressive strength parallel to the grain and hardness of speciments were measured compared with control speciments. The results indicated that the speciments from the altitude of 40 meters above the sea level and with the 20% weight loss were amongst less durable woods. The compressive strength (parallel to the grain) and hardness of speciments for the control samples were 3.12 kg /mm2 & 203.4 kg respectively, which decreased to 1.87 kg /mm2 & 190.3 kg due to the white rot effect. Therefore, this reduction was statistically significant at 5% level compared with control samples.