The presence of B. cinerea has significantly affected the halo width of M. pulcherrima both in absence and presence of 5 mg/mL FeCl3 whereas it was not able to influence the halo at 20 mg/mL FeCl3 (Fig. 1). Similarly, the width of inhibition zones always decreased with increasing of iron concentration. At 20 mg/mL FeCl3 all strains lost their inhibition activity.