Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Diatomaceous Earth (DE) is widely used as a physical means of controlling fleas in household and animal environments. Its use is primarily justified by scientific principles rather than tradition, as it acts mechanically rather than chemically. DE is composed of fossilized remains of diatoms, a type of hard-shelled algae. The powder has microscopic sharp edges that abrade the waxy outer layer of insects, such as fleas, leading to dehydration and death. Several laboratory and field studies support the efficacy of DE against a variety of external parasites, including fleas. For example, research has shown that when applied to pet bedding, carpets, and cracks where fleas hide, DE can significantly reduce flea populations. However, the effectiveness can vary depending on humidity, particle size, and thoroughness of application. DE does not provide immediate knockdown; instead, it may take several hours to days for fleas to die after contact. It is important to note that while DE is generally regarded as safe for external use, inhalation of the fine powder can cause respiratory irritation in both humans and animals. Food-grade DE is recommended for use around pets. In summary, the use of diatomaceous earth for flea control is supported by scientific evidence, primarily due to its mechanical insecticidal action. However, it is best used as part of an integrated pest management strategy rather than as a sole remedy.

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