The present invention provides compositions comprising: a) an adjuvant, which adjuvant is an alkoxylated fatty acid, an alkoxylated fatty alcohol, an alkoxylated fatty amide or alkoxylated fatty amine, which ajuvant has the formula (I)； R1-(CO)p-Z-[-R2O-]q-R3 (I) wherein Z is O, NH, or N-[-R2O-]q-R3 providing that Z is O or NH when p is 1； R1 is C8-C20 alkyl or C8-C20 alkenyl； each R2 is independently C2-C4 alkyl； R3 is C1-C8 alkyl； p is 0 or 1； and q is 2 to 40； and b) Isopyrazam. The invention also provides methods of controlling or preventing infestation of plants by phytopathogenic microorganisms by application of the compositions of the invention to plants, parts of the plants, or the locus thereof.
