The study was performed with two biological products: Mycostop (Streptomyces griseoviridis K61), to control Pythium root rot agents in gerbera, and Fitoverm (Streptomyces avermictilis BHNNCXM-54), to control Tetranychus urticae and Thrips tabaci on cucumber. Biofungicide Mycostop was efficient against root rot of greenhouse ornamentals and vegetables and did not differ in efficiency when compared with fungicide Previcur 607 SL (propamocarb hydrochloride). Composition of micromycete species, their spreading in greenhouse substrate, reaction to Previcur, and interaction with antagonistic microorganisms Sterptomyces griseoviridis were studied. Previcur most efficiently reduced and inhibited the development and spreading of micromycetes in the substrate. Mycostop suppressed the development of many pathogenic fungi species. Both lowest (0.2 %) and highest (1.0 %) rates of Fitoverm were more effective against mites. The death rate of thrips was high when 0.5–1.0 % emulsions were used.
Keywords: micromycetes, gerbera, cucumber, Streptomyces griseoviridis, Streptomyces avermictilis, Tetranychus urticae, Thrips tabaci.