Abstract: This invention relates to a single phase emulsifiable concentrate composition comprising (a) between about 0.05 and about 25 wt. % of a biologically, fungicidally and/or herbicidally active aza compound; (b) between about 2 and about 40 wt. % of a lactam selected from the group of N-methyl pyrrolidone, N-methyl caprolactam, a C8 to C18 alkyl pyrrolidone, a C8 to C18 caprolactam and a mixture thereof; (c) between about 2 and about 20 wt. % of a moisture scavenging agent selected from the group consisting of a liquid molecularly hindered carbodiimide, a molecular sieve or a mixture thereof and (d) between about 10 and about 80 wt. % of a mixture of at least two non-ionic surfactants having an overall hydrophilic/lipophilic balance (HLB) above 7. The invention also relates to the stable oil-in-water (o/w) miniemulsions prepared from the above by dilution to between about 40 and about 99.99 wt. % water for a “pour on”, dip or spray solution useful in the treatment of animals or plants.