The results of the 1996 Forest Damage Monitoring System in comparison to previous years show neary deterioration of the crown condition of Quercus spp. Due to these results an entomological and phytopathological survey was carried out in spring and summer 1997 on plots with dominance of oak sample trees. The reasons for deteriorated crown condition vary for the different plots. Water deficiency seems to be the most important factor influencing the crown condition of oak.
