Some dusts contain conventional insecticides, while others contain no organic chemicals. It can cause skin irritations if improperly handled, and it will harm house plants. Apply boric acid only to hiding places and runways. It is slow acting. Do not expect complete control for at least one week after application.
Boric acid is among the best cockroach insecticides.
Combined with its relative safety, this makes it a good choice for homeowners. Other dusts are based on silica aerogel or diatomaceous earth. These are applied in the same manner as boric acid. They may not be as effective as boric acid because they are repellent to the cockroach. However, they can keep the pests out of certain areas, such as wall voids and attics.