• Food grade diatomaceous earth. IT MUST BE FOOD GRADE!!!! It is a talc like dust that is completely harmless to mammals but it is extremely toxic to ALL insects. The insect only needs to walk through it. The powder is fine enough that it attaches itself to the insect where two things occur. It will absorb the coating on the insects exoskeleton and it is so fine that it manages to get into the insects joints where its abrasive qualities tear the softer tissues and the insect dries out and dies. There are two types of "DE" . The one you want is FOOD GRADE. None food grade can be harmful to mammals.
  • [Arrow pointing up ... to previous answer ] What Tom said is right.
  • The mechanical ones that emit a sound work better when there are less soft surfaces involved. I've used cayenne pepper before. It works.

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