Forest monitoring represents the supervision of the forest condition and the evaluation of national forest fund inventory, in order to provide continuous information on the evolution of vegetation and forest soils, the effects of stress factors (pollution, drought, and changing environmental conditions) on forests, the size and production fund structure. An important role in achieving the objective of forest conservation is the measures to prevent and combat the harmful effects of natural disasters. The analyses of forestry monitoring data are effectuated in order to develop and underline the management measures and to prevent the undesirable situation taking in to consideration the stand health evolution after hoar- frost from 2000 year . The study is presented for a period of 10 years (1999-2008). Data collected were processed by electronic computer using a special program „AS”. The achieved results on key indicators (defoliation, discoloration) were organized by species, age, age classes and classes during the years 1999-2008. In forestry division Oliscani are located 44 permanent surveys of forestry monitoring level 1 (national network 2x2 km).