Dusona aemula is a species of parasitic wasp belonging to the family Ichneumonidae, subfamily Campopleginae.

Front legs yellow from the trochanter, mid leg yellow from the apex of the trochanter, hind tibia yellowish medially, narrowly marked with black basally, rather broadly marked with black apically.

Dusona aemula can be distinguished from the very similar species D. juvenilis by the length of the ovipositor and the presence of a distinct pleural part of the epicnemial carina only sometimes weakly obliterated ventrally.

The wasp seems to be either bivoltine or univoltine depending on its host's life cycle and the climate, as it has at least two generations in continental Europe but only one further north.

[2] Dusona aemula is known from almost the entire palearctic region: Austria, Azerbaijan, Belgium, Bulgaria, Croatia, Czech Republic, Finland, France, Germany, Hungary, Italy, Kazakhstan, Moldova, Netherlands, Norway, Poland, Romania, Russia, Spain, Sweden, Tunisia, Turkey, Ukraine and United Kingdom.