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Do you have any filtration, skimmers, other weed management systems for filamentacious algae etc?
There's not really enough information to help but I can tell you that there are no quick fixes.
what fish are in the lake ?
if its carp then there could be a chance that the stock has fallen as carp will eat the duckweed as there normal food source which could be why in the past it was not a problem as they kept it down and maybe this year there has been a boom in a preditor fish in the lake which has droped the numbers of carp down.
if this is the case the chance is that with this build up of duckweed the numbers of carp will rise quickly again over the next few years and the level of weed in the lake will drop.
to combat duckweed on that size the only thing i can think is to trawl it out useing a boat one section at a time and get out as much as possible as the problem with chemicals is that you could destroy other airation plats in the lake doing more damage.
just a thought
Thanks for your replys. the only equipment in the water is a paddle wheel aerator to keep oxygen levels up. The lakes are well stocked with carp and they do feed on it well. The stocks are good, I can tell from the colour of the water. They have a large amount of food as anglers put in bait along with natural food from incoming water.
I didn't know if anyone had any physical methods that worked well. I was thinking of using a pump to skim it off.
We've a lake at a business park in Surrey we maintain that has duckweed and blanket algae.
Blanket algae is being 'controlled' by Dyofix to reduce lower UV levels and thus the opportunity to grow.
Duckweed - we started out with some nets - time consuming :-( We now use a piece of green 'scaffold' netting' the size of a tennis net, attached by rope at either end, weighed at end corners using tie wraps and metal weights. A couple of us then try to scoop it across pond surface to collect like a big net. Kind of works...but fun this time of year as you don't mind getting wet !
Been told it is impossible to totally remove it and just a small amount left trapped somewhere will propagate V quickly. So we now do regularly when time allows
Bit of an update. I have been using a floating boom to move the weed to one corner and forking it out with a long reach mulching fork. After 3 days of this 2 of us have removed about 32 cubic meters of the stuff!
Thanks for the advice
Ben