Article: If you're worried about the powder getting picked up by the wind, spreading a wet application over the intended area will help it attach to the plants and ground. Wet applications of the powder are also the best option when you're treating a larger area. For example, if you need to use diatomaceous earth on your entire lawn, using a large spray bottle will allow you to easily spread it. Use a water jug, bucket, or similar container to hold the contents. Pour in 4 tablespoons (59 ml) of diatomaceous earth for every gallon (3.8 L) of water. Mix these together thoroughly until the powder dissolves. It’s easiest to pour the 4 tablespoons (59 ml) into a jug of water, seal the lid on tightly, and then shake the container to get the powder to dissolve. If you only need to apply diatomaceous earth to a specific spot, a small spray bottle is the perfect application option. For spraying bigger areas, trying using a garden pump sprayer filled with the mixture.  If you're treating 1 or 2 plants, you might use a small spray bottle. If you're treating a larger area, such as your entire flower bed or garden, you'd want to use a garden pump sprayer. Use your spray bottle or pump to apply a thin layer of diatomaceous earth to all sides of the plants. The plants and other necessary areas should be wet, but not dripping. If you’re applying it to leaves, remember to spray the bottom of the leaves as well.
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Use wet diatomaceous earth to ensure it sticks to the plants. Mix 4 tablespoons (59 ml) of diatomaceous earth with 1 gallon (3.8 L) of water. Fill a spray bottle or garden pump sprayer with the mixture. Spray the plants or lawn section with a fine layer of diatomaceous earth.