It appears that they can be controlled by cutting below water level without the use of chemicals or machinery. From what I read on the above link, there have been several studies done to prove that control can be achieved thru water level manipulation as well.

It also seems that muskrats can assist in control... I think I will pass on this idea! Once again, for every positive there's bound to be a negative haha!

I'm going to try the cutting method below water level and post results and observations over the coming months.