Studies to determine virulences of cryphonectria parasitica(Murrill)barr isolates collected from chestnut orchards in aydın province and to evaluate certain local chestnut cultivars and forest tree species for reactions to this pathogen

Two isolates, one with highest and another with lowest virulence, which wereselected according to the results of the virulence tests conducted on Cryphonectriaparasitica (Murrill) Barr isolates collected from Aydın?s chestnut orchards, wereused in the evaluation of susceptibilities of the chestnut genotypes, which arepredominantly grown in the area. Two different pathogenicity tests indicated thateither N-20-2 or N-3-4 (Işıklar) genotype showed lower susceptibility, whereasN-7-3 (Sarı Salman) was found to be the most susceptible one. In addition to this, nochestnut blight symptoms were detected in nature on the three oak species(Quercus cerris, Quercus coccifera, Quercus ilex), which are the only speciescommonly found in Aydın Province. However it was determined that C. parasiticacaused infections on these oak species in vitro studies. C. parasitica isolates v-c typetested were found to be only compatible with EU 1 and EU 12 European v-c types.