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   Clearing lake of Duckweed... any suggestions?
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   Old Thread  #12 8 Sept 2021 at 9.38pm Login so you can post / reply  Register so you can join in!
In reply to Post #11
Iím assuming thereís little to no wind hitting the water due to trees ? On a pond I worked on we cut down some trees to allow the wind on it and it worked a treat .
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   Old Thread  #11 8 Sept 2021 at 12.09pm Login so you can post / reply  Register so you can join in!
In reply to Post #8
Previous weed control 11 years ago was done using Diquat trade name Reglone produced by Syngenta. Used at 5 litres per 8 acres sprayed into the outboard wake it cleared all aquatic submerged weeds at that time there was no duckweed. All the weed died off 2 weeks later and lakes have been clear till last year. EU banned Diquat in 2019 and all herbicide stocks were to be used by Feb 2020. This would have solved duckweed too but now withdrawn. Hence looking for alternatives.... products or trade names welcomed. Manual efforts are far too labour intensive!
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   Old Thread  #10 11 Aug 2021 at 11.21pm Login so you can post / reply  Register so you can join in!
In reply to Post #5
That sounds like it, Weevils were introduced, pond was only tiny though an acre at most.
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   Old Thread  #9 11 Aug 2021 at 8.57pm Login so you can post / reply  Register so you can join in!
In reply to Post #8
My lake was choked with it but since opening up the banks to the wind it has all disappeared. Saying that, another lake I fish has acres of duck weed and is 70 acres. I suspect the issue there is nutrients.
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   Old Thread  #8 10 Aug 2021 at 1.58pm Login so you can post / reply  Register so you can join in!
In reply to Post #1
I'm afraid manual removal is the best option.

if you were to use a glysophate to spray it off it would only kill the individual leaf that it came into contact with, spraying from a boat you are likely to wash off the glyso before it has had an effect.

if the glyso works the duckweed would sink and rot releasing more nutrient into the water and assassinating the problem.

does the lake get much wind on it?
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   Old Thread  #7 10 Aug 2021 at 12.17pm Login so you can post / reply  Register so you can join in!
In reply to Post #6
Surprised a floating, solar, bailer hasn't been created for the stuff. The motor drives a ram to compress the weed into bails as it travels around the water surface. The bails can then be removed.
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   Old Thread  #6 9 Aug 2021 at 2.02pm Login so you can post / reply  Register so you can join in!
In reply to Post #1
Might be worth checking the nutrient level in the water.
Anything changed over the last two years or just before?
More fertiliser being used on the surrounding area and finding itís way into the lake?
More bait being thrown in?
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   Old Thread  #5 9 Aug 2021 at 10.24am Login so you can post / reply  Register so you can join in!
In reply to Post #4
A lot of the chemicals used are now banned EU wide.

Many were very effective.

I believe the below post was looking at using weevils to control the spread of some weeds.

Its a thankless task keep ontop of it, that is for sure.
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   Old Thread  #4 8 Aug 2021 at 10.45pm Login so you can post / reply  Register so you can join in!
In reply to Post #1
A good few years ago a small pond i fished was infested with that stuff, virtually couldn't see water at all. The club got a company to introduce some bug/insect of some kind that loves to eat the stuff and it solved the issue. I can't help with name of said creature and the club has long since gone. Pond was called Pirelli Pool just in case it may jog someones memory here.
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   Old Thread  #3 7 Aug 2021 at 7.14pm Login so you can post / reply  Register so you can join in!
In reply to Post #1
A lake I was on the owner got some weed killer spray from America (couldn't buy it easily on the UK) he waded around and sprayed and you could see the duckweed dying within about 5 minutes. Not sure what it was but it didn't seem to harm the fishing.
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   Old Thread  #1 7 Aug 2021 at 7.04pm Login so you can post / reply  Register so you can join in!
One of our local pools has been infested with duckweed 2 years now anyone had any success getting rid on their lakes? Floating booms made of rope threaded pipe insulation and 2" plastic pipe wrapped in scaffold netting have worked well to drag it into a margin to net out but it grows back with a vengeance! There must be some product to spray it with safely so as not to kill fish or invertebrates. Any ideas guys?
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