Help! Ants in my manure pile!
What can I do to get rid of all the ants that are in my overwintered tarp-covered pile of well-rotted horse manure? Now it's springtime and I wanted to use the manure, but I found an awful lot of lively ants in the pile. I'm worried that if I spray an insecticide into the pile, it will be bad for the veggie plants I'll be shoveling the manure on to and bad for the people who eat the veggies.
Should I leave the tarp off? Is there anything (such as vinegar, or other non-human-toxic) that gets rid of the ants but doesn't affect people long-term?