In the years 2000 and 2001 the effectiveness of control of take-all (Gaeumannomyces graminis var. tritici) in winter wheat with seed dressing fungicides at different levels of root infection was studied. Seeds were treated with siltiofam, fluquinconazole or a standard fungicide Baytan Universal 094 FS. At low level of root infection recorded at GS 75 siltiofam and fluquinconazole significantly reduced root infection as compared to untreated control by 73.5-89.9% and 65.5-89%, respectively. At a medium level of infection the respective values were 56.2 and 54.9%. No significant differences between the efficacy of the two new fungicides were stated. Standard seed treatment product showed only limited activity in the early spring. Reduction of winter wheat root infection by 1% caused the increase of grain yield by around 1%.