Mosquito dunks use a naturally-occurring bacteria species that produces toxins that only harm fly larvae, which includes mosquitoes. They might not be practical to use in a water source that keeps getting flushed-out when it rains, but in more standing water sources (like rain barrels) they can be useful to prevent larvae from occupying them.

Any netting that blocks a mosquito-sized insect should work, including insect mesh netting sold to cover vegetable crops and window screening mesh sold in rolls at a hardware store. Even old pantyhose will work, though all of these would need to be secured in a way that doesn't fall off easily (rubber bands might break after a few weeks or months). We don't collect information on brands available so don't have advice about where to find small or custom-sized pieces, though all of these materials should be fairly easy to cut.

Miri

Thanks so much.

You're welcome.