You watch helplessly as the ants march up the picnic table leg, onto the tabletop, and into the picnic meal. Here’s a foolproof way to stop them in their tracks: Place a plastic container on the bottom of each picnic table leg. Fill with water. The ants won’t be able to crawl past. See more uses for Plastic Containers.
Next: How to get rid of ants from outdoors to inside with salt.