Article: Diatomaceous earth is tops for pest control.(The garden)

Diatomaceous earth is nontoxic to mammals and birds. However, there are several types of DE. Use only food-grade DE in and around your home or business. It is labeled GRAS or Generally Regarded As Safe, and kills insects more effectively. Do not use swimming-pool grade as this form is not effective as an insecticide. It also may contain a high level of crystalline silica which, when inhaled, can cause silicosis, a deadly lung disease.

Food-grade DE is sold as "fossil shell flour," and is approved by the FDA to be added to livestock rations at a rate not to exceed two percent. As a livestock feed additive at one percent to two percent, it can kill worms and other ...

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