The devil created this shiz. That place is toast. IT would cost a bazillion dollars to rid that place of that evil weed.
Actually, LSU has found some type of organism that eats it. I was talking to a guy who's brother-in-law works with it.
He says that they have successfully removed Salvania from a few small ponds and such.
They have the organisms/bugs in a bucket filled with Salvania, which the bugs and their larva live in. they take those buckets to the ponds and after a few short weeks it is eaten and gone.
This bug eats the root systems, which kills the plant permanently and is why it has worked so well.
No, I don't know what's it call but supposedly you can buy it from LSU or the LA Dept. of Ag.