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Non-Toxic Pest Control for the Eco-Home

Here are some natural and non-toxic alternatives
to keep household pests at bay

For garden variety creepy crawlers: ants, aphids, bed bugs, carpet beetles, cockroaches, ear wigs, fleas, flies (fruit & house), silverfish, spiders, ticks, etc. – ahhhhhhhh!

I try to encourage bugs to live outside the house, but if they are persistent about being inside, I would definitely consider this treatment:

Food-grade Diatomaceous Earth: a chalky powder that is the natural fossilized remains of diatoms (a type of hard-shelled algae). The diatom particles are small and sharp, but at their microscopic size they are only harmful to the exoskeletons of small insects. It is a mechanical killer, not a chemical one. Food-grade diatomaceous earth is so safe you can sprinkle it throughout your house, around your vegetable patch, and even rub it into a pet’s fur. Keep in mind that this product may also kill beneficial critters. To use, sprinkle a thin layer indoors or outdoors where insects are found. Leave for two days or however long you need to control the bugs and then clean up and reapply as needed. Also called ‘Insect Dust,’ this product is a registered insecticide with the government.

A 4.4 lbs bag of Insect Dust (Diatomaceous Earth) from St. Gabriel Organics costs $9.99

Cucumber: place a few peels of cucumber at the entry point of invasion of the pest to repel/deter. Works for ants, cockroaches, and silverfish.

Mint leaves: scatter these in places of infestation to deter ants and flies.

Eucalyptus oil: drop some on cloth and place near areas of infestation of flies and moths.

Soapy water: If you want to instantly kill an insect in your home – Mix water and soap flakes (from something like a bar of Ivory soap) into a spray bottle, you can kill all bugs on contact. This is because the soap component breaks down the waxy exoskeleton and lets the water enter the bug and drown the critters quickly. Sorry bug!

For termites

Sand barriers: sand barriers are a preventative measure that works on an underground termite invasion because those termites cannot tunnel through sand at certain grain-sizes, and sand does not retain moisture, which is crucial to termite colonization. Sand barriers can be applied in crawl spaces under pier and beam foundations, under slab foundations, and between the foundation and concrete porches, terraces, patios and steps. Other possible locations include under fence posts, underground electrical cables, water and gas lines, telephone and electrical poles, inside hollow tile cells and against retaining walls. You need sixteen-grit sized sand and the layer must be at least 4 inches thick in between wood structures and soil. This is a physical method of control rather than chemical and provides long-term protection, but should still be regularly inspected.

Nematodes: these microscopic worms are a good form of termite treatment for chemically-sensitive individuals and environmentally-sensitive areas. Nematodes can be pumped into the infested area and they will kill the termites. Ick.

Cedar oil: products such as CedarCide’s Agent Gold contain cedar oil, which is apparently very lethal to termites but totally non-toxic, organic, and chemical-free. It is a very effective contact killer and repellent to termites and can be used on any wood structure. The way it works is that the product penetrates the wood and the aromas from the cedar oil disrupt termite (and apparently ants – bonus!) pheromone systems in a lethal manner. The cedar oil also a drying agent and promotes moisture evacuation from the wood, which also helps prevent and eliminate the existence of termites.

Other non-toxic methods: electric shock treatments (really!?), microwave devices (Oh my!), physical termite trapping/nest excavation.

Almost Non-Toxic – Boric acid bait blocks: if you place these around the structure where you need to eliminate termites, these blocks will attract the pests (termites) to consume termiticides and die without broad chemical application. This is a less-toxic alternative to widespread pesticide spraying to your home. Also works on roaches.

Carpenter Ants

Temperature control: freezing or heating methods (such as with a tent) will kill ant colonies since they are very sensitive to temperature ranges in the wood ‘galleries’ that they form in structures. There are pest control companies that do this.

Diatomaceous Earth: same as above . . .  kills carpenter ants in the same way. Make sure to only get FOOD GRADE DE as other forms of DE are dangerous and not necessarily harmless to plants, animals, and people.

Prevention: Fix/replace any dry rot wood in your home or wood damaged by moisture. That is a breeding ground for carpenter ants.

Resources include:

Related: 7 Tips for Chemical-Free Pest Control

Read more: Health & Safety, Home, Household Hints, The Green Divas Podcast, , , , ,

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32 comments

+ add your own
7:12AM PST on Nov 7, 2013

thank goodness for this article, i was just looking for something like this!

10:48PM PDT on Sep 17, 2013

used on fleas Diatomaceous Earth - will try it on the ants - thank you

5:49AM PDT on Aug 3, 2013

I haven't lived in FL for very long and we just discovered VERY, VERY small ants. The house is brand new, we never leave any foods out, all caulking, etc. seems intact so we have no idea where they come from. It seems that our neighbors have them also. One neighbor (a total neat freak!) even had an exterminator come and he still has these ants. He was told by the exterminator that they're called "ghost ants". I don't want to use any poisons and can't find an eco friendly exterminator. Does anyone have any natural ideas? Thank you!

7:18AM PDT on Sep 3, 2012

Thanks for the comments on the danger to lungs - that is somewhat vital information that was not mentioned in the article. Apart from that, great article, although it is not as comprehensive as it could be with a bit more research. I always find it funny to read about people escorting spiders (or insects) outdoors with stern warnings! lol I've never actually had that work....but thanks for the comic relief!

8:46PM PDT on Aug 21, 2012

We have a standard comment at home, "Leave and you live. Don't and you die!"

I do my best not to harm anything in its own, outdoor environment (I am in their home, after all), but I do reserve the right to keep my home the way I like it !

8:46PM PDT on Aug 21, 2012

We have a standard comment at home, "Leave and you live. Don't and you die!"

I do my best not to harm anything in its own, outdoor environment (I am in their home, after all), but I do reserve the right to keep my home the way I like it !

5:36PM PDT on Aug 21, 2012

Nutmeg for grease ants

5:11PM PDT on Aug 21, 2012

When using diatomaceous earth it's a good idea to invest in and use a dust mask to reduce the risk of breathing it in and damaging the lungs. If you use it on your animals it might be a good idea to dust them lightly outside to reduce their risk of breathing it in as well. Unless you can convince them to wear a dust mask!

12:49PM PDT on Aug 21, 2012

Many thanks.

10:25AM PDT on Aug 21, 2012

Great ideas, great tips.

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Disclaimer: The views expressed above are solely those of the author and may not reflect those of
Care2, Inc., its employees or advertisers.

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