The variability of some cultural and morphol ogical characters of 3 Drechslera sorokiniana (Sacc.) Subram strains was investigated on culture medium Potato Dextrose Agar under water restriction conditions, adjusted with polyethylene glycol (PEG 6000) in concentrations of 5%, 10% and 20% by volume. An alysis of the variance of the colony growth rate showed a decrease in the share of the fungal strain factor, but an increase in the contribution of the PEG 6000 concentration factor in the 7 day fungal culture. The reaction of the winter wheat genotypes Mo ldova 614, Moldova 66 and the Selania / Accent line at the early stage of ontogenesis (6 days) showed a differentiated response, but especially a high organ specificity tested in producing of the variability of embryonic root length and of the strain to th e action of the culture filtrate of the D. sorokiniana strains.