They are frequently found in soil, growing well at neutral or around neutral pH in the mesophilic temperature range. Many soil pseudomonads are fluorescent. Phytopathogenic pseudomanads generally have narrow host ranges, where they appear as practically pure cultures. Apart from Ps. The reconized species include P. aeruginosa, P. cepacia , P. chlororaphis, P. cichori, P. fluorescens, P. mallei, P. pseudomallei, P. putida, P. solanacearum, P. stutzeri, P. syringae , and P. testosteroni .
Many strains can cause human infection.
They tend to have a sheathed polar flagellum. They produce lipase and ferment D-mannitol. They form water-insoluble yellow pigments. Many are phytopathogens. They require organic growth factors.