“It's a tiny wasp, you know, the tip of a pin size. And it comes along, finds an emerald ash borer egg and lays its egg inside that egg. And then it hatches and emerges as a wasp. What we say is, if you've ever seen the movie Alien, where the thing comes bursting out of the dude's chest…that's how parasitoids work.”
― Chris MacQuarrie, Research scientist for the Canadian Forest Service at Natural Resources Canada

Since its arrival in North America in 2002, the emerald ash borer has killed millions of ash trees, with billions more at risk. To mitigate the damage, Canadian scientists have released 100,000 parasitic wasps into the wild. In this two-part series with Natural Resources Canada, we dive into the fascinating science of biological control agents: bugs fighting bugs.

Simply Science podcast (Natural Resources Canada): Who can take on the spruce budworm?
https://nrcan.canada.ca/simply-science/who-can-take-on-the-spruce-budworm/23893