Longleaf Wattle Gall Wasp Trichilogaster acaciaelongifoliae

This Australian gall wasp became an unexpected biological warrior when the longleaf wattle spread beyond its native range, becoming an invasive pest. Scientists deployed it as a biological control agent, introducing it to South Africa in 1985 and Portugal in 2015 to parasitize the invasive acacias. The introduction proved remarkably successful, offering a sustainable solution that lets nature do the pest control work—a perfect example of harnessing natural enemies against invasive species.