Just noticed this post (initiated in Oct.).
Guess I'm a contrarian to the identifications that have been offered so far.
Granted, the posted photo is lacking in clarity and detail. But some telltale traits prompted me to toss in my 2-cents.
Here's a "tweaked version" of the original photo.
I don't think the posted image is baby pondweed, southern naiad or widgeon grass. Instead, I'm guessing it's Chara - which is a higher form of algae, rather than a plant; and shown in this comparison to the original photo.
I might be wrong. But, if it is Chara, "herbicides" will prove completely ineffective.
Basically, it is necessary to first make a
positive identification of the pest "weed" (maybe from a more detailed photo) before deciding which management-option makes the most sense.
