To apply diatomaceous earth effectively for pest control and other uses, first identify the target pests or areas needing treatment. Then, lightly dust the diatomaceous earth in a thin layer in those areas. Reapply as needed, especially after rain or heavy moisture. Use a mask and gloves when applying to avoid inhaling the dust. For indoor use, focus on cracks, crevices, and other hiding spots. For outdoor use, apply around the perimeter of the house or garden.
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