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LSUisKING12
LSU Fan
Baton Rouge
Member since Sep 2010
151 posts

Pond weed identification and help
Does anyone know what kind of weed this is growing in our pond? It has slowly grown out about six feet into the pond and some spots further out.

Curious on what it would take to get rid of this so it doesn’t grow out any further and doesn’t harm the fish. Sorry if pictures are big, first time posting pictures.







Cool Hand Luke
LSU Fan
Member since Oct 2008
1318 posts

re: Pond weed identification and help
Kills All Aquatic is what you want. Will not harm fish. Don't know what the weed is but it will be gone after spraying it.


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SaDaTayMoses
LSU Fan
Da Platte
Member since Oct 2005
2994 posts

re: Pond weed identification and help
Great cover for bass


CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1544 posts
 Online 

re: Pond weed identification and help
Send these photos to Dr Chris Mudge, aquatic weed specialist, LSU AgCenter to see if he can ID from the photos cmudge@agcenter.lsu.edu. Report back if he can provide you the ID without a sample of the plant or more detailed pics, I’d like to know myself. I’d be happy to send the pics to him myself but he may need more info than I can provide.

The aquatic plant is coming out of winter dormancy and the whorled leaves on the green material projecting above the water surface looks like it could be water hyssop (bacopa), egeria, elodea, ... but I’m really not sure without more detailed pics.

Dr. Mudge can provide you with proper chemical control recommendations once the weed is ID’d. I’m assuming you don’t have triploid (sterile) grass carp in the pond, otherwise that weed wouldn’t be present.

Here is a good website on aquatic weed ID and control from Texas A&M AquaPlant


Bill Parker?
Member since Jan 2013
3253 posts

re: Pond weed identification and help
Diquat. Death in a bottle.


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specchaser
LSU Fan
lafayette
Member since Feb 2008
2045 posts
 Online 

re: Pond weed identification and help
I’m not sure how invasive that weed is but I agree. Some weeds and grass in a pond is a great thing. As long as it doesn’t take over and choke the pond it makes great cover for baitfish and gamefish. All the plankton, grass shrimp , bugs, minnows, crawfish, etc that live in grass like that can be a huge benefit to the environment


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LSUisKING12
LSU Fan
Baton Rouge
Member since Sep 2010
151 posts

re: Pond weed identification and help
Thanks everyone for the replies. I reached out to Mudge and this is what he said

quote:

This plant looks like bacopa (aka waterhyssop), but not completely certain and definitely not sure on the specific species. This could also be rotala since it looks similar to bacopa, but still leaning towards bacopa. Glyphosate (64 oz/acre) + flumioxazin (2 oz/acre) + aquatic surfactant at 0.25% v/v should control most of the emergent material, but herbicide translocation to the plant material below the water surface may survive. Mix these products into at least 25 gallons of water and spray evenly over the water surface. As an alternative, whatever isn’t controlled below the water surface and growing in the deeper water, can be treated with diquat (1 gallon/surface acre) + flumioxazin (100 ppb) as an in-water/subsurface treatment. Unfortunately, treating the water column is more expensive, despite the potential to provide better control.

I communicated with a colleague in FL and thinks this plant won’t spread much further if left alone. He said it tends to behave fairly well, and getting rid of it will lead to other things coming in. Something to consider.

If you decide to spray herbicides, make sure you purchase an aquatic approved product to be legal and reduce the chance of killing aquatic organisms, including fish. Non-aquatic products may contain additives that could be toxic. Also, treat no more than 50% of the waterbody to eliminate issues with the dissolved oxygen declining rapidly and causing a fish kill.


CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1544 posts
 Online 

re: Pond weed identification and help
Thanks for sharing Dr. Mudge’s response. Good info, particularly the part from his colleague in FL who thinks it’s not likely to spread any further.

What % of the pond area, your best estimate, is covered by the bacopa? The only thing I’d correct is in Dr. Mudge’s last sentence: treat no more than 25% of the pond area to mitigate the chance of causing an oxygen deletion and protect the safety, health and well being of the fish community.

A biological form of weed control is to use sterile (triploid) grass stocked a low density of 5 fish per surface; that low density will not totally deplete the submerged, succulent, aquatic plant community that the grass carp favor as food, but it would still take a few years for the fish to grow to a large enough size to make a major dent in reducing the aquatic weeds. Some pond owners like grass carp (those that emphasize aesthetics), others don’t (usually those that emphasis fishing) - just wanted to make you aware it’s an option. A permit ($50 last time I checked) is required by LA Dept of Wildlife & Fisheries to stock them.
This post was edited on 3/26 at 3:48 pm


LSUisKING12
LSU Fan
Baton Rouge
Member since Sep 2010
151 posts

re: Pond weed identification and help
Appreciate the help Craw. I think if we treated we would only treat an area around where we commonly stand so the bait fish doesn’t lose their complete habitat. The pond is about two acres and it’s grown out about six feet all the way around.


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