Twenty five isolates of Armillaria spp. were collected from Mazandaran provinces of Iran. The isolates were identified by using restriction analysis of Internal Transcribed Spacer 1 (ITS1) region. In this study, the wood destroying activity of three A. mellea isolates were investigated on nine forest plants species. The analysis of wood destroying activity data showed that the isolates M24 and M2 caused the highest and the lowest level of wood destroying activity with 2.58 and 1.82 % wood weight loss, respectively. The results indicated that the resistance of the plant species was very different. Among the tested plant species, Pinus nigra and Picea abies with 4.39 and 3.51% wood weight loss respectively, showed susceptible reactions respectively to A. mellea. However, Cedrus deodara and Cryptomeria japonica with 0.40 and 0.64% wood weight loss respectively were regarded as tolerant species to A. mellea. The tolerant plants species have potential to be used for the management of the disease and might potentially reduce the damages caused by A. mellea.
