Trioxys indicus  is an important parasitoid. It is very potent in biological control. 

In Italy and in Europe is often used the parasitoid Diaeretiella rapae, however also other species were recorded in nature e.g. aphid parasitoid Lysiphlebus fabarum (Marshall) and Lysiphlebus testaceipes (Cresson) (Hym. Braconidae).

Often, in nature, some parasitoids function best working together, as they might have some different affinities in the ecosystem. We observed several Trichogramma species and Telenomus from Heliothis eggs. Their study under lab conditions showed that their optimum temperatures were not the same and thus when some stopped parasitizing (in our microclimate conditions, where in summer each day the temperature amplitude goes up from 12 to 48ºC and down again), others got their chance in a slightly different temperature range on the same resource. We then did mixed releases and had higher parasitization rates than with "the best" species alone. S.A.Hassan did experiments in apple orchards with combined  Trichogramma releases in Germany and got to the same results (I have no longer the publication references. He worked at the Biologische Bundesanstalt in Darmstadt, Germany). In simple terms: we make the insects run in the Lab olympics to chose the best (under lab conditions) and think of only working with the gold medal winner for releases, but in the field the cooperation of various species makes sense and works out better. 

In northwest Uttar Pradesh, India Binodoxys (=Trioxys) indcus (Subba Rao & Sharma) was evaluated in my laboratory. The results demonstrated that it has potential to maintain the aphids (also Aphis gossypii) below economic injury level.