Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants Coontail, I think.

Nice setting, spend a lot of time in the Rockies. Where are you?

That's not Coontail but the leaves sure look similar - first thing to do is ID it, and someone should be along shortly to help. Once you achieve that you can determine if it's preferred forage for GC, and if so, they are a biological option, but don't overstock and be patient for results. Different macrophytes respond to different herbicides - so once you ID it you could perform spot treatments. I use Aquathol Super K, and while expensive, it always performs well for spot treatments on pondweeds and coontail. However - cheaper and more effective treatment options may exist depending on the plant ID. I rarely use herbicides so I'm not super well versed. Again, someone will come along shortly to assist I'm sure.