I've used g.carp only twice against e.milfoil; eradicated it both times which may not be a good thing. Now both ponds are palgued with unwanted plankton blooms. Higher densities of g.carp were required. E.milfoil is pretty stemmy and not real leafy thus g.carp have to be crowded to get them to eat enough of it to make a big impact.
I think a better solution is to chemically kill milfoil, replant a beneficial vegetation and when it then becomes unmanagable use g.carp at low densities to thin but not eliminate the native less invasive, beneficial vegetation.
