Abstract
In the present paper the knowledge of evaluation of the health condition of Castanea sativa (Mill.) in forest stands was summarised. It was found out that the fungus Cryphonectria parasitica (Murr.) Barr damaged the coppices until 60 years. Degree of damage (I<sub>hc</sub>) in the evaluated localities ranged from 1.11 to 3.50. Between 1992 and 2001 the biological protection in orchards by the method of hypovirulent converted strains from France was used. This method had not been used in forest stands until then. The efficiency of canker treatment ranged from 38.9% to 64.9%. On the basis of genetic variability of C. parasitica isolates they were classified into 4 vegetative-compatible (v-c) groups. &nbsp;
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