Another great option for fleas, and other buggy critters!! 
Lemongrass and Cedarwood essential oils are very effective, as well!!!

Homemade Flea Powder

Published on Healthy Holistic Living .com

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Ingredient List and Benefits of Homemade Flea Powder:

This homemade flea powder is composed of Diatom Flour, Neem Powder, Yarrow Powder and Eucalyptus Oil. All 4 ingredients are traditionally used as very effective insect repellents and recommend by many holistic vets as a successful flea and insect killer and repellent.   

Food Grade Diatom Flour (also called Diatomaceous Earth or DE)

Diatomaceous Earth is soft powder made up of fossilized remains of tiny aquatic organisms called diatoms. Their skeletons are made of a natural substance called silica. Under a microscope, DE is very sharp, allowing it to puncture the exoskeleton of insects and causing them death by dehydration. Diatomaceous Earth kills insects by physical action, not chemical. It’s important to note that DE particles are so small so it just feels like a fine baby powder to humans and pets. It is a simply a mineral silica. Food grade, fresh water DE is harmless to humans and pets. For more information about the safety of food grade DE, see the end note at the bottom of this post.  

Neem Powder

Neem is an herb used in Ayurvedic medicine.  It has been used for centuries as a very effective herbal insect repellent, repelling fleas, ticks, lice, mites, ants and mosquitoes. Neem has a few natural active ingredients that make it so effective . For example, the compound in Neem, Azadirachtin, disrupts the metamorphosis of insect larvae. So by inhibiting molting, Neem keeps the larvae from developing and they die without producing a new generation. Azadirachtin is so repulsive to insects that they would rather starve to death than touch anything with traces of neem.  Another neem compound is called salannin and it’s equally as effective of a repellent. In a few studies, it’s even been proven even more effective at repelling biting insects than those repellents containing the chemical concoction of DEET.

Neem also has many moisturizing properties and helps get rid of excess dryness and scaling. It helps soothe irritated skin. The anti-bacterial properties of neem prevent development of any further skin infection. Because Diatomaceous Earth can by very drying, Neem helps protect your pet from excess dry skin.  

Yarrow Powder OR Essential Oil

Yarrow’s most ancient use and most famous use in the herbal medicine world is as a natural wound healer. It’s also considered a sacred herb by many cultures around the world because of it’s healing ability.  Yarrow is a wonderful anti-inflammatory for skin conditions and soothes irritated skin. It is also anti-microbial and has pain relieving properties. Because pets with fleas tend to get secondary infections from flea bites, Yarrow protects your pet from those secondary infections and also helps soothe red, irritated skin.  

Eucalyptus Essential Oil 

Eucalyptus (Eucalyptus globulus, Eucalyptus citriodoro) is a natural bug and insect repellent. There is evidence that the components in eucalyptus oil are as effective and sometimes more effective than DEET.  Eucalptus oil also has antiseptic properties for healing after bites.