What effect does the use of diatomaceous earth have in pest control?

The use of diatomaceous earth in pest control works primarily through a mechanism of dehydration and physical damage rather than through toxicity or repellent properties. Diatomaceous earth is composed of the fossilized remains of tiny aquatic organisms called diatoms. When insects come into contact with diatomaceous earth, the sharp particles easily pierce their exoskeletons. This disruption results in the loss of bodily moisture, leading to dehydration and ultimately causing the death of the insect.

This method is particularly effective against soft-bodied insects, such as ants and cockroaches, as well as other pests. The physical nature of diatomaceous earth as a desiccant sets it apart from chemical pesticides that operate through toxicity. Hence, its effectiveness in pest control lies in its ability to dehydrate and kill insects rather than simply trapping, poisoning, or deterring them.