The effect of biopreparation Biochikol 020 PC on linear growth of mycelia of two Rhizoctonia isolates was tested under laboratory conditions along with that of fungicide Baytan Universal 19,5 WS for comparative purposes. Complete retardation of mycelial growth of both isolates was observed in case the application of fungicide Baytan Universal 19,5 WS at the concentration of 0.1% and a considerable growth inhibition was stated at the temperatures of 10°C and 30°C. The effect of seed dressing with the above mentioned preparations on plant infestation by Rhizoctonia fungi was tested in a greenhouse experiment on two cultivars of spring wheat: Banti and Ismena. Baytan Universal 19,5 WS reduced plant infestation especially at the highest soil moisture content of 20 kPa. Biopreparation Biochikol 020 PC and diversification of soil moisture levels did not result in a reduction of wheat infestation rate. This biopreparation stimulated the increase of root mass of both cultivars at moisture content of 20 kPa.

The incidence of winter wheat stem base diseases: Fusarium foot rot (Fusarium spp.), eyespot (Ramulispora herpotrichoides), sharp eyespot (Rhizoctonia spp.) and take-all (Gaeumannomyces graminis) in the years 1999–2003 was assessed in this study. Previous crops were barley and oilseed rape. Eyespot occurred on the greatest percentage of plants throughout the whole period of the study. In 2000–2003 a deficiency of rainfall was observed, especially at the time of increased water requirements of plants.