In many species that employ this method, the small size of the wasps requires alternate defense systems rather than aggression, things like chemical defense and large numbers of adults at the foundational stage.
The small size of the wasps requires alternate defense systems rather than aggression. This is in many species. The small size of the wasps requires things like chemical defense. This is in many species. The small size of the wasps requires large numbers of adults at the foundational stage. This is in many species. These many species employ this method.