The ability of the Streptomyces isolates to inhibit the fungal
growth was determined using an agar plate antagonism
bioassay [33]. F. oxysporum inoculums was placed on either
side of a two-days-old colony of each streptomycete. After
incubation at 28∘C for 5 days the inhibition zone was formed
and its presence characterized the Streptomyces isolate as
positive.