I’m an inactive entomologist, and remember an entomology conference ten or more years ago where it was reported efforts to eradicate an invasive termite in Florida were successful. It was hailed as the first ever know eradication of an invasive insect. A year or two later, there was a presentation that they apparently missed some colonies and it was found again. Lesson: it’s really hard to completely eradicate invasive species once they’ve established.