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If you are to remove the grass and weeds then probably best strimming / brushcutting and raking off before trying to spray it, it looks way too dense and thick to spray first and you would have to strim it out after they had died off anyway and you won't be able to spray just yet anyway with the temp too low deep is the water and does it contain fish / amphibians etc etc, not sure if you would be required to hold the PA6AW ticket or not, Nick at NMGS would be able to advise on that as Im sure he has the cert for water course spraying.
I think it would work on the blanket weed in your photo but I would need to double check.
Any weedkiller would need to be applied when the weeds are actively growing. At the expense of talking myself out of a job I wold recommend that the worst is removed with a springbok rake and barley straw is added into the water in a few months time to keep the blanket weed in check.
Nick
Many thanks Nick, How much barley straw would need to be added and how?
Mark.
spring Tyne rake with a pole tied on to extend the length or a good heavy duty nett (it is heavy) you will not get it all out no matter what you use. i have used a product called aquaplanton its a white powder that you broadcast over the surface i think it works by neutralizing the nitrates. i have used the straw in nets but you need a lot and tie some rope on so you can drag it out later, a pond that size you will need at least 2 bales
Many thanks David.
Every ones help greatly appreciated
Mark
Many thanks for the help.
Mark
1- Plastic bunker sand rakes on lengths of rope 'slowly' pulled in, resulting weed left on bank for 12-24 hrs to allow any 'pond-life' to return.
2 - Large 'ponds' can't effectiveley be dealt with using the Barley method (at least from our experience)
3- Go look a www.dyofix (black option) - we've used for last two years with great success. If you search LJN you'll find this discussed in depth.
4 - Normally indicates hi levels of nutrients - worth checking pond source (ie stream, surface water run off etc etc).
5 - We look after in total 5 balance ponds at business parks
6 - Traditional spraying of products will not address blanket weed (which it looks like)
7 - we have PA6AW's - so have tried a fair few options
http://www.landscapejuicenetwork.com/forum/topics/water-pond-qualit...
Source is surface water from nearby housing estate.
Get a basic water testing kit. would suggest run off will be continually be high in nitrates etc which will mean an ongoing issue.
Dyofix helps by staining water black to stop algae production and is harmless (ie it is not a chemical - merely a food quality dye), used in lots of large formal ponds and at golf courses. makes pond look stunning.;-)
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