I can see the oil working in a water butt where I don't really want or need anything living and there's a reasonably quick turnover of the contents, but in a pond I would be concerned about it affecting the other creatures. I don't have a pond (or space for one) so it's purely a theory. Will try it in the butts though.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
For some it's a choice in the garden between no mosquitoes or no pond - if you get a big reaction to the bites. It's likely that the most people get equally bitten by mosquitoes but only those allergic to the saliva realise they have been bitten.
If you add any oil at all it will will spread and cover the entire surface of the pond and prevent CO2/O2 exchange, so would be very bad for a wildlife pond.
Shaky science! C02 and O2 will go straight through a thin film of vegetable oil.
I would aslo suggest experimeting with soap/dishwashr emulsifier. Try for the thinnest film possible. Add it very carefully.
location: Surrey Hills, England, ex-woodland acidic sand. "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
If you add any oil at all it will will spread and cover the entire surface of the pond and prevent CO2/O2 exchange, so would be very bad for a wildlife pond.
Shaky science! C02 and O2 will go straight through a thin film of vegetable oil.
Really? - how interesting - please explain.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
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In the sticks near Peterborough
I live in west central Scotland - not where that photo is...
I would aslo suggest experimeting with soap/dishwashr emulsifier. Try for the thinnest film possible. Add it very carefully.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.