In vitro action of silicon sources on isolates of Curtobacterium flaccumfaciens pv. flaccumfaciens.

ABSTRACT The aim of this study was to evaluate the in vitro action of potassium and aluminum silicate, at various concentrations (0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 and 10.0 %), on isolates of Curtobacterium flaccumfaciens pv. flaccumfaciens (Cff). The fungicide tolylfluanid was used as a positive control. Paper discs embedded with the test compounds at different concentrations were placed in the center of each Petri dish after solidification of the culture medium (NSA) containing the bacterium, and the measurements of inhibition halos were performed after 48 h incubation. Potassium silicate (Supa Sílica®) did not affect the growth of Cff, while the aluminum silicate (Rocksil®) had an inhibitory action on the evaluated isolates.