The invention provides an agrochemical composition comprising: (a) one or more fatty acids or derivatives thereof； and (b) a strain, culture, culture filtrate, spores or mycelia of a species of a fungus or oomycete, or a metabolite produced by a species of a fungus or oomycete, which strain, culture, culture filtrate, spores, mycelia or metabolite directly or indirectly (i) inhibits the growth or reproduction of plant pathogens or (ii) kills plant pathogens. Also provided is a method for controlling fungi or oomycetes at a locus, a method for promoting growth in a plant and a method for controlling nematodes at a locus.
