Diatomaceous earth works very well for the crawling insects. Not so much for the ones that fly, of course.
It's kind of a horrible way to go, for a bug, in that it's a mechanical insecticide and it's like us walking on broken glass. Ants will walk to the line, touch it, and then immediately turn around. I puff it around the perimeter of my house and it keeps any crawling insect at bay until it rains again. If you can puff it under baseboards it will stay dry in there for ages.
It's non-toxic, but you probably don't want to breathe in the dust. That applies to all fine particles, though.
It's kind of a horrible way to go, for a bug, in that it's a mechanical insecticide and it's like us walking on broken glass. Ants will walk to the line, touch it, and then immediately turn around. I puff it around the perimeter of my house and it keeps any crawling insect at bay until it rains again. If you can puff it under baseboards it will stay dry in there for ages.
It's non-toxic, but you probably don't want to breathe in the dust. That applies to all fine particles, though.