Cellulolytic and Pectolytic Activity of Cylindrocarpon destructans (Zins.) Scholt. Isolates Pathogenic and Non‐Pathogenic to Fir ( Abies alba Mill.) and Pine ( Pinus sylvestris L.) *

In studies on cellulolytic and pectolytic activity of C. destructans , it was found that only one of the twenty isolates studied exhibited cellulolytic activity. The total activity of this isolate was similar in media with CMC and powdered cellulose. The specific activity was, however, two times higher with powdered cellulose. All isolates identified as pathogenic to fir and to pine produced pectolytic enzymes. Not all of them, however, exhibited exo‐ and endo‐PMG activity. In general, an increase of total activity of exo‐PMG was accompanied by an increase in the specific, activity. Of the non‐pathogenic isolates, only one did not show pectolytic activity. The results of our studies have revealed that there exist no significant differences in pectolytic activity between the isolates pathogenic and non‐pathogenic to fir and pine. Also, the isolates belonging to both groups were not cellulolytic except one non‐pathogenic.