- The Douglas-fir tussock moth
- defoliates Douglas firs, true firs,
- and spruce in western North America.
- The Douglas-fir tussock moth wasp
- defoliates the Douglas-fir tussock moth
- and its caterpillar by laying its eggs
- in either adult or its larva.
- The tiny wasps are particularly tuned
- to the sex pheromones of the adult moths.