@colinpurrington @2legged An ovillanta is a bit of a different approach. A tray of water is set out; mosquitoes lay eggs in the water, Once a week the water is run though a screen, removing any larva. The same water is put back in the tray, because now it smells like mosquito larva, which will attract more mosquitos to lay eggs there. No chemicals needed, but you must remember to use the screen every week.https://en.wikipedia.org/wiki/Ovillanta#mosquito