Lots more information on the FFF website including the first symposium in Bozeman, MT in 2006.
Lots of reading on this stuff. It appears to be a native and is impacting tailwaters. We sent it to New Zealand and it is wrecking havoc there. I did think that the Northern California council FFF had some doing an experiemtn to kill it but may be wrong. I will email to find out.
I have posted in the past about Diddy mo and a search may turn up more inofrmation.
The links on the side of the referenced page has a weath of information about this stuff. I had the dvd at the Charlotte fly fishing Show last year. In particular the EPA Link shows a distribution map of N america and the symposium link has a description of locations and other stuff. Get it to your fisheries folks.
Irish
http://www.fedflyfishers.org/Default.aspx?tabid=4381