Mosquito larvae in the water butt

[Dophus]

I seem to have a thriving community of mosquitos in my water butt. I need to get rid of them before they evolve into something more sinister.

Is there anything I can add that won't then kill the plants when I use the water in the garden?

Thanks

(Thank you to wonderful google for that snippet!)

Oooh - sounds like a good idea! I like the sound of the cooking oil.

Me too, dophus - sounds simple, effective and (presumably) organic! Very elegant. Hope it works