Additionally, the same antifungal activity was observed from the extracts of the solid
culture of ACTA1551 without the presence of F. oxysporum.
This observation may suggest that the streptomycete does not
require the target fungus in its area to induce the production
of the antifungal substances. The antifungal activity is fungus
independent and the antifungal components may belong to
the main metabolism of Streptomyces rochei ACTA1551.