Looks like some slender spikerush mixed in as well, I second Greg's grass carp recommendation as the spikerush will be a constant challenge regardless of the herbicide you use.
www.qualitylakes.com"If once [the people] become inattentive to the public affairs, you and I, and Congress and Assemblies, Judges, and Governors, shall all become wolves."
- Thomas Jefferson 1787
