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Duck weed and frogs
On 6/3/09 23:47, in article , "DerekW"
wrote: "Sacha" wrote in message ... On 6/3/09 19:05, in article , "Judith in France" wrote: On Mar 6, 5:26 pm, Sacha wrote: Any chance that frogs and/or tadpoles eat duckweed?! -- Sachahttp://www.hillhousenursery.com South Devon Exotic plants, shrubs & perennials online Straw will clear it. Don't know about Frogs though. Judith It's quite a large pond and barley straw hasn't helped in the past - or not enough, anyway. I suppose we could try dragging some clumps of it across the pond..... -- Sacha http://www.hillhousenursery.com South Devon Exotic plants, shrubs & perennials online Are we confusing duckweed Lemna minor with algal blooms and filamentous algae which barley straw does control. No, what we have is duck weed. And it's worst on the pond we don't want to put fish into! We had huge problems on the shoot with a pond being covered with a thick carpet of duckweed and despite a serious effort to remove it during which we scooped off around 60-80 kilos a week over a month or more it came back within days. This year 2008 it had all but disappeared the only difference being the introduction of proper pondweed the previous year which has finally taken hold and colonised the margins it could be the heavy rain or the weed reducing the nutrient level or even overspray when our farmer applied herbicide (unlikely he's extremely careful about when he sprays and the pond is about 30 yds from the nearest cultivated area) We do get a lot of duck but in the covered years they didn't make an impression on the carpet and they positively avoided the pond we have few frogs ( heron activity) and no fish. Common Koi and Grass Carp do eat duckweed and I did a little research and found freshwater shrimp also do . One other suggestion about the sudden reduction in duckweed under windy conditions when the water gets a little ripple the weed stacks up in layers at the windward end a good time to scoop a pile out! DerekW Absolutely right. Last time we had a gale that blew the duckweed in the right direction, I noticed it as I came in through the gate in my car - though "must go and scoop that off" and promptly got diverted so never got round to it. I'm waiting for the wind to be in the right direction because it had it all arranged in a neat little pile for me! -- Sacha http://www.hillhousenursery.com South Devon Exotic plants, shrubs & perennials online |
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