Abstract
A trial based on the method of biotic series (M a ń k a, 1974) was undertaken in order to study the effect of the fungal communities isolated from the soil, rhizosphere, roots, and mycorhiza of silver fir self-seed on the development of a parasitic fungus Cylindrocarpon destructans (Zins.) Scholt., which causes dying of fir seedlings in some mountain forests (K o w a l s k i, 1980a). It was found that on the plots where the self-regeneration of the fir (Abies alba Mil.) was good the resistance index of the investigated soil fungal community was about four times as high as in the plots where no self-seed of silver fir was observed.

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