Does Diatomaceous Earth Kill Geckos?  by Patricia H. Reed
Diatomaceous earth is a naturally occurring, powdery white dust
that can take care of slugs or squash bugs outdoors or a flea or
cockroach problem indoors, with little risk to the health of the
people and other creatures that share the space. Whether you
have geckos as pets, or are trying to avoid harming the tiny
insect-loving lizards that keep the pest population down in your
garden, you can use diatomaceous earth, with some limitations,
without fear of killing the reptiles.      How Diatomaceous
Earth Works      Diatomaceous earth is the fossilized remains of
algae and other single-celled creatures, called diatoms. The
sharp edges of the individual grains cut into the exoskeletons
of insects or through the slime of slugs, causing them to lose
moisture and die of dehydration. To deter and kill pests around
plants, the material is sprinkled in a ring around the base of a
plant. Indoors, it is often sprinkled over carpets and around
room perimeter