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Diatomaceous earth is composed of the fossilized remains of tiny organisms known as diatoms. The edges of these fossilized diatoms are extremely sharp and will lacerate the exoskeleton of nearly any crawling insect that comes in contact with them. Once their outer shell has been lacerated, the powdery DE dehydrates the insect, killing it, although not instantaneously.


For more information on how long diatomaceous earth will take to kill an insect please see: How Long Does Diatomaceous Earth Take to Kill Insects?


While Last Crawl Diatomaceous Earth Insecticides work well to kill most crawling insects, there are a few species that DE is known to be especially effective against. These include:


• Ants

• Bedbugs

• Fleas

• Cockroaches

• Silverfish

• Flour Beetles

• Darkling Beetles

• Grain Beetles

• Carpet Beetles

• Colorado Potato Beetles

• Caterpillars

• Earwigs

• Centipedes

• Millipedes

• Sowbugs

• Pillbugs

• Spiders

• Crickets

• Slugs


Is the insect you are looking to exterminate not mentioned above? If the pest is a crawling insect, DE will most likely kill it. Apply food grade diatomaceous earth in the cracks and crevices around your home as well as in other areas where the insects may be hiding. Leave the DE down for a few days to a week and monitor the infestation in order to judge the DE's effectiveness. If you find an insect that Last Crawl Diatomaceous Earth Insecticide seems to work particularly well against be sure to let us know! We can be contacted using the form below, by email at or on Facebook, Twitter and LinkedIn


Please note: DE is likely to harm nearly any insect, including those that may be beneficial to your home or garden. Use caution when spreading DE in areas that these important insects may come in contact with.


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We advise that you do your own research on the benefits of Diatomaceous Earth and make your own decisions. Choosing to use the product for uses other than what it is registered for is done solely at the risk of the end-user. We are not in the position to advise the use of our RLE products for any purpose other than what the product is registered for and what is indicated on the packaging.