Detection of bacteriocin production was studied under distinct conditions using strains of plant pathogenic bacteria from the genera Erwinia, Pseudomonas and Xanthomonas. 58.06%, 79.31% and 40.00% of producing strains were found respectivelly in the three groups of bacteria using the 523 medium which was the best for the detection of bacteriocin production. Increasing agar concentrations added to the medium up to 1,5% improved the detection. The amount of medium added to the Petri dishes did not affect bacteriocin production. The longest incubation time (72h.) improved the detection of haloe production. Ultra-violet irradiation in low dosages seems to improve the visualization of haloe prodution but this is dependent on the tested strains.
bacteriocins; Xanthomonas; Pseudomonas; Erwinia