The video itself doesn’t give enough information to tell us whether it will work or not.
According to the Texas Water Resources Institute web page at http://cise.tamu.edu/caddo, the weevils exclusively eat salvinia. During tests, they did not eat any other plant matter.
Also, they prefer warm weather. They probably cannot survive the winters there, but that’s being tested.
So it looks like it might really work out fine. It’s certainly better than spraying chemicals.
Trivia: Caddo Lake is Texas’ only natural lake (except oxbows).
