You should check for pyrrolnitrin and few pyrrolnitrin analogs produced by some strains of Burkholderia cepacia or for additional types of siderophore (such as pyocyanin) and phenazine-type antibiotic produced by Pseudomonas aeruginosa and by P. chlororaphis, respectively.
Yes ,siderophores such as pyocyanin and the antibiotic phenazine produced by a strain of bacterial biocontrol agent Pseudomonas fluorescens can be used against the pathogen Colletotrichum gloeosporioides in the field . It should be used as prophylacticrather than curative during the initial stages of infection.