Summary Bacteria can be both highly communicative and highly competitive in natural habitats and antibiotics are thought to play a role in both of these processes. The soil bacterium P seudomonas protegens Pf‐5 produces a spectrum of antibiotics, two of which, pyoluteorin and 2,4‐diacetylphloroglucinol ( DAPG ), function in intracellular and intercellular communication, both as autoinducers of their own production. Here, we de...