How to apply, and inexpensively spread and treat areas of your house using Diatomaceous Earth. When used appropriately, diatomaceous earth can kill off fleas within a few days. Only apply the powder to plants that are being eaten so you don't kill beneficial insects. Diatomaceous Earth for Fleas. Otherwise, sprinkle the powder from an old spice shaker or make your own shaker. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/3\/35\/Apply-Diatomaceous-Earth-Outdoors-Step-1.jpg\/v4-460px-Apply-Diatomaceous-Earth-Outdoors-Step-1.jpg","bigUrl":"\/images\/thumb\/3\/35\/Apply-Diatomaceous-Earth-Outdoors-Step-1.jpg\/aid9918319-v4-728px-Apply-Diatomaceous-Earth-Outdoors-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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