Rodeo is "approved" here[1], but Connecticut is a very highly regulated state, so that doesn't mean quite the same thing that it might elsewhere.

I would need a permit ($200 nonrefundable fee!) for any aquatic herbicide, and it looks like it would require professional application.

The permit application[2] also requires a NDDB (national diversity database) species review application forms, which can take 6-8 weeks, and probably has a fee too.

I found a web page[3] linked from ct.gov[4] that lists licensed applicators, and breaks the list down by certification type ("aquatic pest control"? sounds like zebra mussels...).

I also found a 2013 aquatic herbicide permit report[5], which indicates that very little glyphosate is permitted in the state...like, less than a single quart in some decently-sized, fairly rural towns. I'm not sure whether this means that the permitting process is especially strict, or that applying for proper permits is rare.

I'm going to call around on Monday to see if I can get a professional opinion on the viability of herbicide in my location, and a quote for same.

If "better living through chemistry" doesn't work out, I'll be back to researching physical control strategies. Any recommended resources?

Thank you!

PS: Links, in case they're useful for other Connecticut folks.

[1] http://www.ct.gov/deep/lib/deep/pesticides/restrictedpermitusepesticides.pdf
[2] http://www.ct.gov/deep/lib/deep/Permits_and_Licenses/Waste_Permits/aquatic_app.pdf
[3] http://www.kellysolutions.com/CT/
[4] http://www.ct.gov/deep/cwp/view.asp?a=2710&q=324266&deepNav_GID=1712
[5] http://www.ct.gov/deep/lib/deep/pesticides/aquaticpesticideusetown2013.pdf