In vitro TFX antibiosis assay against A vitis CG78. Legend: The indicated TFX producing strains and their non-producing mutant derivatives cultured as a single colony near the centers of the plates and allowed to grow 4 days at 27°C. The plates were then misted with a dilute suspension of A. vitis CG78. The plates were photographed two days following misting. A zone of growth inhibition is present around the R. etli CE3(pT2TFXK) colony, but not around any of the other colonies.