Hardiness Zone: 7a
By Marsha from Grafton, VA
When I was in high school, we raised mosquitos and had to draw each stage of development. If you put a thin coating of cooking oil on the surface of the water, it blocks their breathing tubes and they die. Non-toxic and you only need a little oil swished over the surface.
Please take the environmentally friendly advice already given here! Chlorine bleach is highly toxic to the general environment as well as to humans and animals!
Purchase a couple or few "feeder fish" (e.g. comets or gold fish) at the local pet store, about a quarter a piece usually they love mosquito larvae. Depending on conditions (e.g. the water stays), they can live for years. If they die, you're out a quarter. Since they eat all of the larvae in a day or so, you'll probably need to drop a few flakes of feed in for them when the larvae are gone.
This is an eco safe link to mosquito control. It has step by step instructions. In a nutshell:
Drop mosquito dunks containing Bacillus thuringiensis into the breeding area. These dunks will last up to 30 days and are safe for animals and children. They can even be used in watering troughs and water bowls. It may take up to 2 weeks before you see results, as these dunks target the larvae and prevent the larvae from hatching, interrupting the breeding cycle.
What are you going to use the water for? I had this problem with rainwater I was collecting for the flower beds. I just sprayed Raid into the water. It never hurt my flowers.
You can buy tablets that kill mosquito larvae at a garden center. Just give them a call.
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