The present invention provides a stabilized pesticidal composition comprising at least one granular substrate material containing at least one metal chelate of 2-(2'-nitro-4'-methylsulphonylbenzoyl)-1,3-cyclohexanedione, a method of producing a stabilized granular pesticidal composition which comprises incorporating a metal chelate of 2-(2'-nitro-4'-methylsulphonylbenzoyl)-1,3-cyclohexanedione in to or on to a granular substrate material； and a method of killing or controlling weeds or unwanted vegetation (without damaging beneficial plants and or seeds) which comprises applying a herbicidally effective amount of the stabilized granular pesticide composition of the invention to the foliage, tissue or locus of the weeds or unwanted vegetation.
