What's the best way to prevent mosquitoes from breeding in the water of your Christmas tree stand?
After unsuccessfully googling around for relevant discussions, it occurred to me that most people on the worldwide web will never face this problem. Most people who keep Christmas trees in their houses live where it's too cold for mosquitoes to be active at Christmas. And most people who live where it's warm enough for mosquitoes at Christmas don't keep Christmas trees in their houses. The only people who have this problem are folks like us, tropical Americans who insist on following Christmas traditions that are totally wrong for our climate.
I have come up with two possible approaches, but I'm not sure which one is better.
What do you guys think? Which sounds like it would work better? I don't think doing both is an option - they'd probably cancel each other out.
After unsuccessfully googling around for relevant discussions, it occurred to me that most people on the worldwide web will never face this problem. Most people who keep Christmas trees in their houses live where it's too cold for mosquitoes to be active at Christmas. And most people who live where it's warm enough for mosquitoes at Christmas don't keep Christmas trees in their houses. The only people who have this problem are folks like us, tropical Americans who insist on following Christmas traditions that are totally wrong for our climate.

I have come up with two possible approaches, but I'm not sure which one is better.
- A layer of oil (e.g. cooking oil or olive oil) on top of the water should act as a barrier that prevents the mosquito larvae from getting their breathing tubes to the surface.
- Soap (e.g. dishwashing liquid) in the water will lower the surface tension of the water, which should make it impossible for the larvae to stay at the surface to breathe.
What do you guys think? Which sounds like it would work better? I don't think doing both is an option - they'd probably cancel each other out.
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