Paulownia is known as a fast growing tree and it can be used in several applications. The present study investigated the effect of Nano-silver and Nano-copper and Nano- zinc oxide on resistance of Paulowina (Paulownia fortunei) wood against the white rot fungus (Coriolus versicolor). Wood specimens with a dry density of 0.37g/cm3 were impregnated with a 400 ppm aqueous suspension of micronized nano-silver and nano-copper with particle sizes ranging from 10 to 80 nm , in a pressure vessel at 2.5 bars for 20 minutes. Treated specimens were inoculated with the fungus and incubated for sixteen weeks at 26˚C with 65% relative humidity in accordance with the EN113 standard. After incubation the mean percentage weight losses of specimens were measured. Percentage weight loss of control samples was much higher than treated ones. Results of the analysis of variance showed that the impregnation of wood with nanosilver, nanocopper and nanozinc oxide significantly increases the decay resistance of Paulownia against this white rot fungus.

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