A synergistic antimicrobial composition containing flumetsulam and an isothiazolone biocide chosen from among 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one and N-n-butyl-1,2-benzisothiazolin-3-one. A synergistic antimicrobial composition containing diclosulam and an isothiazolone biocide chosen from 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one and 2-n-octyl-4-isothiazolin-3-one.Se describe una composición antimicrobiana sinérgica que contiene flumetsulam y un biocida de isotiazolona seleccionado de entre 4, 5-dicloro-2-n-octil-4-isotiazolin-3- ona, 2-n-octil-4-isotiazolin- 3-ona y N-n-butil-1,2- bencisotiazolin-3 -ona. Una composición antimicrobiana sinérgica que contiene diclosulam y un biocida de isotiazolona seleccionado a partir de 4,5-dicloro-2-n-octil- 4-isotiazolin-3-ona y 2-n-octil-4-isotiazolin-3-ona.
