2,4-Diacetylphloroglucinol or Phl is a natural phenol found in several bacteria: * Specific strains of the Gram-negative bacterium Pseudomonas fluorescens. This compound is found to be responsible for the antiphytopathogenic and biocontrol properties in these strains. * It is also found in Pseudomonas protegens, where it has the same activity against various plant pathogens. * Lysobacter gummosus, a bacterium which lives on the skin of red-backed salamanders. * Isolates of Pseudomonas aurantiaca found in Ukraine, living in root symbiosis produce it to control Fusarium oxysporum.