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  1. #1

    Default Canadian pondweed and Curly leaf removal

    Currently working at a fishery that is having a big problem with Canadian pondweed and Curly leaf pondweed, it is growing at a rapid rate due to the clarity of the water. I have been manually removing the weed with a cutter and a rake, but it is a very large job when it is only me on the lake (I occasionally have help but it seems to be a losing battle). Any suggestions on other ways to tackle this? Ive looked into getting someone in but the machine only cuts to 5ft deep, and it would grow back up in a matter of weeks. Also looked into herbicides but seems most like Diquat etc are banned in the UK.

    Any suggestions would be helpful

  2. #2
    Join Date
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    on the banks of the A5
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    Default Re: Canadian pondweed and Curly leaf removal

    With DEFRA approval it may be possible to use Roundup

  3. #3

    Default Re: Canadian pondweed and Curly leaf removal

    Quote Originally Posted by glueman View Post
    With DEFRA approval it may be possible to use Roundup
    And that can be put in the water without harming the fish, inverts etc?

  4. #4
    Join Date
    May 2016
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    Default Re: Canadian pondweed and Curly leaf removal

    Cutting Canadian pond weed invariably makes things worse as every stray piece that settles in shallow enough water will root. At other times of year it becomes brittle and then it spreads of it's own accord. The best method is grubbing out the roots early and late season, tough job.

  5. #5

    Default Re: Canadian pondweed and Curly leaf removal

    Quote Originally Posted by bumble54 View Post
    Cutting Canadian pond weed invariably makes things worse as every stray piece that settles in shallow enough water will root. At other times of year it becomes brittle and then it spreads of it's own accord. The best method is grubbing out the roots early and late season, tough job.
    We have been trying to get it from the roots. We made a rake from steel that basically trolls the bottom, but it is very very heavy, and when the weeds start to wrap it its near impossible to lift out (we drop in in and drag it back from the bank). So with the big V cutter we were also trolling, its the same sort of story, and as we are rowing with oars its a hard oul job lol. Just wish there was some herbicide that we could use, or some magical method, but from research it seems that just gotta pull it out by hand.

  6. #6
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    May 2016
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    Default Re: Canadian pondweed and Curly leaf removal

    Fraid so. If there is vehicle access?, has anyone got a landrover, preferably with a winch to attach the rake chain to.

  7. #7
    Join Date
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    Default Re: Canadian pondweed and Curly leaf removal

    We have a 3 acre clear water pool with similar issues. We used to cut it which was done with mechanical weed cutters and easy enough but the real issue was dragging out and disposing of the cut weed which for an ageing membership was too demanding. We now use permitted chemical treatment, including most recently RoundUp, which are fairly effective but every time we find something that works it gets banned, and I think this now includes RoundUp. We're currently trying a dye that inhibits light and thus retards growth.

    You shouldn't try to eradicate it as it has huge food harbouring qualities, just keep it 3 or 4 feet sub surface or clear patches.
    Last edited by sewinbasher; 08-06-2017 at 07:08 PM.
    “There is no more lovely country than Monmouthshire in early spring. Nowhere do the larks sing quite so passionately, as if somehow inspired by the Welsh themselves. There is a blackbird on every thorn and a cock chaffinch, a twink as they call him there, on every bush...... It moved me profoundly. I had been spared to see another spring, and I thank God for it.”

    Oliver Kite
    “A Spring Day on the Usk”
    A Fisherman’s Diary

  8. #8
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    May 2016
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    Default Re: Canadian pondweed and Curly leaf removal

    [QUOTE=sewinbasher;2239793] We're currently trying a dye that inhibits light and thus retards growth.

    I do hope you've had professional advice, these dyes can do the job but have the potential to cause massive algae die off with drastic effects of oxygen depletion.

  9. #9

    Default Re: Canadian pondweed and Curly leaf removal

    You shouldn't try to eradicate it as it has huge food harbouring qualities, just keep it 3 or 4 feet sub surface or clear patches.[/QUOTE]

    Yea don't want a bare basin, but its right up to the surface in some parts so it needs to be controlled to an extent, or it will end up unfishable.

    There is vehicles access yes and I think ill try the winching idea thanks!

  10. #10
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    Default Re: Canadian pondweed and Curly leaf removal

    [quote=bumble54;2239803]
    Quote Originally Posted by sewinbasher View Post
    We're currently trying a dye that inhibits light and thus retards growth.

    I do hope you've had professional advice, these dyes can do the job but have the potential to cause massive algae die off with drastic effects of oxygen depletion.
    We're fortunate enough to have a former EA fisheries scientist in the club as advisor and have not suffered any unfortunate side effects. We have also been using a solar powered sonic "algae buster" to control the algal blooms for 5 or 6 years now.
    “There is no more lovely country than Monmouthshire in early spring. Nowhere do the larks sing quite so passionately, as if somehow inspired by the Welsh themselves. There is a blackbird on every thorn and a cock chaffinch, a twink as they call him there, on every bush...... It moved me profoundly. I had been spared to see another spring, and I thank God for it.”

    Oliver Kite
    “A Spring Day on the Usk”
    A Fisherman’s Diary

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