I've never tried this, but think it's a great idea. Mix sugar and yeast, let
ants eat. When moisture inside ants causes yeast to grow, ants explode.
This may only work indoors since the yeast sugar mix would need to be kept
dry. Sounds like your trouble is outside, but I thought I would toss out the
idea anyway.
Good luck,
Eileen

Fish wrote:

Is there any way to kill ants organically? We have tried pouring boiling
water on the colony, but it is just too large. Are there any natural
predators of ants that could survive in a south-western Virginia climate?

Thanks

Fish