The wasps lay eggs into a live caterpillar. This type of interaction is called:
Parasitoidism is a form of parasitism in which an organism invades another organism (host) for a certain period of time. It is different from parasitism in that true parasitism does not cause the death of the host, but parasitoidism usually leads to the death of the host. An example of parasitoidism is when the host organism is used as a nursery for young. The parasitoid wasps called Glyptapanteles and the caterpillar are an example for this.