Trichogramma wasps are specialist parasitoids, where females lay eggs inside lepidopteran (moth/butterfly) eggs, killing the host from within before it hatches—preventing larval emergence rather than direct feeding.

 They are the precise solution for a specific pest problem.

Green lacewings act as generalist predators via their larvae (“aphid lions”), which actively hunt and consume soft-bodied pests like aphids, mites, thrips, and small eggs/caterpillars on plant surfaces.  

They aren’t as devastating as trichogrammas for pests, but they suppress small pest outbreaks generally, heavily curbing crop yield loss from many different pests.