The Kelpak SL bioregulator concentrations of 0.4; 0.04; and 0.004 ml3/cm3 applied under laboratory conditions significantly
modified the analysed features of tested fungi and the most their sporulation process. Intensified production of spores
was observed in antagonistic fungi: T.harzianum, T. kaningii and enthomopathogenic V. lecanii, whereas inhibition in
pathogenic F. poae and V. dahliae, respectively by 25.4% and 74.5%. Generally, at its lowest concentration in the medium
(0.004), Kelpak Sl contributed to reduction of the surface growth of the colony and increment of the analysed fungi biomass.
On the other hand, the extract of algae (Ecklonia maxima) significantly inhibited the growth rate of F. poae and increment
of T. harzianum biomass. Fungistatic effect of the applied concentrations of Kelpak SL was observed for V. dahliae - a dangerous
horseradish pathogen and enthomopathogenic V. lecanii species on the media with 0.004 cm3.
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