Pros and Cons of Diatomaceous Earth

Q: Is diatomaceous earth non-toxic?

A: There is NO such thing as a non-toxic insecticide. If any chemical we used were non-toxic then it would not be able to kill any bugs either. The fact is, and the EPA demands this of us, all of the labeled products we use to manage pests in our work are pesticides, and these are defined by EPA as “any substances or mixture of substances intended for preventing, destroying, repelling or mitigating any pest.” This includes growth regulators, repellents, and all “natural” pesticides that may be derived from plants or minerals, including diatomaceous earth. The most we can say is that diatomaceous earth has low toxicity to humans.

Q: Will diatomaceous earth kill fleas?

A: Yes, but there are a few things to know. While it is a natural solution for those looking to avoid chemical pesticides, it does have a downside. The bugs have to come into direct and prolonged contact with the material for it to have an effect, so you have to spread it pretty extensively throughout the home. To be effective, the powder has to stay bone dry, so it isn’t the most effective method for a watered yard.

Do not expect immediate results. It will take about ten days to kill adult fleas after they come into contact with the material. More fleas will appear as flea eggs hatch; they too will have to come into contact with the material.

Advantages: Long lasting, low odor, easy to apply, not absorbed into surfaces and is readily picked up by pests, if spilled can be easily cleaned up

Disadvantages: easy to misapply, can become airborne and can contaminate non-target surfaces, must be kept dry, can be inhaled by the applicator and a respirator should be worn, can be abrasive and eye protection should be worn.

Q: Are there any common application errors?

A: If diatomaceous earth or other dusts are applied too heavily they may become “physically” repellent – the bugs just don’t want to rest on a heavily dusted surface or wade through a barrier of dust material. As one industry consultant stated it 30 years ago, “if you can see the dust on the surface after you applied it, IT WAS TOO MUCH.” It is our tendency, and comfort level, to be able to see the result of our application, and we may believe that a nice, even, visible layer is just perfect. In reality, this is an over application and detracts from the effectiveness. Even a nearly invisible layer of the dust allows particles to adhere to the lower surfaces of the bugs that walk over them or rest on them, and sorptive dusts like silica gel also may have an electrostatic charge to them that helps them attach to insects.

There are two huge advantages to using the inorganic dusts like silica gel and DE – extremely low hazard to people and pets and many years of residual effectiveness. As long as they are applied to a dry surface the dust particles remain available to the bugs that touch that surface at some point in time. This is perfect for wall voids and interior voids of equipment or furnishings that are okay for dust to be in. Also appropriate for within around the edges of floors behind molding or carpet edges, and carefully within deeper crevices.

Bottom line is that dusts have an excellent role in control of many structural pests and DE should be non-repellent if it is applied discreetly.

Q: Are any pest control companies willing to use diatomaceous earth and other low toxic, more “natural” pest control treatments?

A: YES! It’s a misconception that all pest control companies push dangerous pesticides. A good pest control company will have technicians that take the time to speak with the customer about the pest problem, the customer’s goals in pest control (including low toxic remedies), and then discuss the different products that meet the customer’s requirements. Additionally, a good pest control company will adhere to integrated pest management (IPM) principles. An IPM approach is focused on the removal of the three key elements pests need to survive: food, water, and shelter. By concentrating on eliminating the sources of these elements, IPM aims to correct the root cause of the pest problem. You gain a longer-term solution to pests in the least intrusive manner possible.

Q: What about boric acid as a flea treatment?

A: Contrary to things you read on the Internet, boric acid is NOT a desiccant and does not kill by plugging the breathing openings on bugs. It is toxic only by ingestion. Unless you and your pets get a boric acid transfusion into your blood stream, it will not work on fleas.  Further, boric acid also is NOT non-toxic, is NOT safe to use around children, is NOT toxic to “all” insects, does NOT attack their nervous systems, is NOT a “drying agent” to insects’ bodies, is not absorbed through their exoskeletons, and is not the “secret” ingredient in professional products. It is a product that the pest control industry uses in specific formulations for specific pests and is applied according to the manufacturer’s label.

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