Pond Boss Forums AQUATIC VEGETATION Identifying plants Weed ident, video inside.

Hi all, seems I have lots of one particular weed coming up from as far as the sunlight will reach, not sure if its a bad weed or not but it is proliferating. I think it is leafy pondweed Potamogeton foliosus. I can cut it easily enough but do i need to? do these tend to choke out a pond/lake or is the decay in the winter under the ice the real bad part? In my video it is weed number 2 I believe.

Not sure what weed number 1 and 3 are or if i got number 2 right.

Here is the video

No weed ideas, but NICE VIDEO.

The more weeds present going into ice and snow cover the greater the chance of oxygen shortage and fish kill. Weed number 2 does look like one of the narrow leaf pondweeds. Camera was moving too fast and did not pause to get a good close look at the detailed weed characteristics.
Do you know what the minnows were with the horizonal stripes? Were they your dace?

Hi Bill, yes those striped minnows are dace - they look much different than when in the net for some reason.

A little bit more into the video I pause the cam so there are stills of the weeds. 1st weed is at 2:03 , second at 2:24, 3rd at 3:01.

Ill be removing some of those weeds a little later this summer - right now i think they help the trout and larger PS escape the otters!

A shot of the dace

That is a type of milfoil, possibly Eurasian Water Milfoil. Bad for the pond, it will completely take over and is an extremely invasive species. To kill that plant and not any of the others, a 10 PPB dosage of Fluridone will kill it. It has to stay around 7-10 PPB for close to 30 days for it to be effective, so if you have water flowing through the pond it will be hard to keep that dosage rate. If there is no flow through I really like using Fluridone (Sonar A.S. or it's generic equivalent) as it only affects some invasive species at low dosage rates and does not affect native plants. I don't know of another systemic herbicide that will do that.



This one I am not sure about as I haven't seen it before.


Potamogeton foliosus.could be correct, but any species of Potamogeton will be controlled (you can spot treat areas) with Aquathol K or Aquathol Super K

Responding to your point below. Im hoping its northern milfoil, I have underwater footage of this lake from 4 years ago at the end of July and it appears there is that same milfoil in the lake but not in a prolific way - just he odd one here and there and some shallower spots with more present. All the weeds present today seem to be the same as were there 4 years ago. Fingers crossed.

The possible Potamogeton Foliosus in my older footage seems to have grown and then by mid summer fallen to the bottom and lose it's color so probably dying. In the footage there is an abundance of plankton of sorts.

Here is the video, the underwater footage starts at about 4:15 mark - before that we are eating hotdogs....as one does.



That is a type of milfoil, possibly Eurasian Water Milfoil. Bad for the pond, it will completely take over and is an extremely invasive species. To kill that plant and not any of the others, a 10 PPB dosage of Fluridone will kill it. It has to stay around 7-10 PPB for close to 30 days for it to be effective, so if you have water flowing through the pond it will be hard to keep that dosage rate. If there is no flow through I really like using Fluridone (Sonar A.S. or it's generic equivalent) as it only affects some invasive species at low dosage rates and does not affect native plants. I don't know of another systemic herbicide that will do that.