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How to apply diatomaceous earth outdoors
Avoid breathing in or touching the dust particles.
Diatomaceous earth is a fine powder, which can irritate your throat if you breathe a lot of it in. Wear a face mask to avoid inhaling the powder, and wear gloves on your hands so that the powder won't dry out your skin.
If you don't have a face mask, you can also wear a bandana or towel over your mouth to keep out the dust. Use diatomaceous earth on plants that truly need it.