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Swirly green layer on pond?
#522040 06/02/20 02:50 PM
Joined: Sep 2007
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Can anyone help with this?
Have a pond in northeast Wisc. . Last year and now this year there is a green layer of something just barley under the surface of the water. Any waved seem to go right over top of the green stuff, if It rains it will completly disapear and come back in a day or two. I don't know if it could be pollen or something else. It's not a mat like some algae is. it alomost seems like powedery but its just under the surface like barely under the surface. Any ideas what it is or how to get rid of it?

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Re: Swirly green layer on pond?
PHOEBE #522041 06/02/20 03:18 PM
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This comes up most every summer with forum member's ponds, including my pond. It is often very difficult to diagnose over the web, but the following guide should help you narrow it down to a couple options...

https://www.townofchapelhill.org/home/showdocument?id=28866


My gueses are...

Euglena and other flagellated algae (page 10),
Diatom Blooms (page 11),
Protozoan Scums (page 15).

Pay attention to the cyanobacteria pages and make sure it's not any of those...they can be pretty nasty.


Fish on!,
Noel
Re: Swirly green layer on pond?
PHOEBE #522054 06/03/20 06:36 AM
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water meal ? Wolfia? type stuff maybe.

Re: Swirly green layer on pond?
PHOEBE #522056 06/03/20 07:50 AM
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The pine trees in the background are a clue.
Walk up to one and shake a branch, green powder that gently falls to the ground? That happens from the wind too.

Re: Swirly green layer on pond?
PHOEBE #522059 06/03/20 10:07 AM
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Thank you . I am leaning towards the pollen from the Pines.. Other than cutting down the pines i am not sure there's much i can do to get rid of the stuff?

Re: Swirly green layer on pond?
PHOEBE #522060 06/03/20 11:04 AM
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It's pollen season, won't last forever.
If you were in the path of those storms last night, not much pollen will be blowing out this week!
It's nature, embrace it smile

Re: Swirly green layer on pond?
PHOEBE #522083 06/04/20 07:34 AM
Joined: Sep 2014
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I live in deep east Texas where there is nothing but pine forest. EVERYTHING gets covered in greenish yellow pine pollen at times. Look around on other items NOT in your water and see if you see concentrations of the yellow stuff. Car windshield,items sitting out by your pond, etc. etc. That should help determine if it is pine pollen. Just a thought to help you narrow it down.


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