Clear, stable, efficacious, aqueous microemulsions of an active triazole fungicide, e.g. penconazole, optionally with another agriculturally active chemical, are provided herein. The aqueous microemulsions are obtained by providing an inert matrix composition comprising a defined mixture of nonionic surfactants, including a C.sub.6 -C.sub.18 alkylpyrrolidone, e.g. octylpyrrolidone, an alkylphenol ethoxylated alcohol having an HLB.gtoreq.6, preferably 10-20, e.g. nonylphenol ethoxylated alcohol with 9 EOs, and an anionic surfactant selected from a salt of dodecyl sulfate, dodecylbenzene sulfonate, dodecyltoluene sulfonate and lignin sulfonate, preferably sodium dodecyl sulfate, and water, optionally with a C.sub.1 -C.sub.4 alkylpyrrolidone, e.g. N-methylpyrrolidone, and water. The inert matrix composition is admixed with a triazole fungicide, present in a C.sub.1 -C.sub.4 alkylpyrrolidone, if not already present in the inert matrix composition, to form a microemulsion concentrate. Upon dilution with water, a stable, aqueous microemulsion is formed characterized by having a high loading of triazole fungicide e.g. 1-25% (before dilution), preferably about 14%.