The one that comes to my mind right away, and I'm not sure it goes all the way to actually having been considered established, is the work that's happening in Toronto around the Asian longhorned beetle. That was identified quickly, so we had the early detection. There was rapid response, and that beetle actually hasn't been seen in about the last four years. If that beetle were to get out of Toronto, it would be devastating to the forest ecosystems of the country.
I don't know, but my colleague from Natural Resources Canada might have an example of something that was established and then eradicated.