Diatomaceous Earth (DE) is a naturally occurring, fine, off-white powder derived from the fossilized remains of microscopic aquatic organisms called diatoms. These organisms have cell walls primarily composed of silica, which gives the powder its unique properties. This article provides practical instructions for using DE to control scorpions, focusing on safe and effective application methods.
Understanding Diatomaceous Earth’s Effectiveness
The effectiveness of diatomaceous earth against scorpions is purely mechanical. The fossilized shells of diatoms are made of silica, and when ground into a powder, the particles possess microscopic, sharp, jagged edges. When a scorpion crawls across DE, these abrasive particles inflict tiny cuts on the arachnid’s tough, waxy exoskeleton.
These abrasions compromise the scorpion’s protective outer layer, allowing the fine powder to act as an absorbent. It draws out oils and moisture from the scorpion’s body, a process called desiccation. This mechanical action prevents pests from developing resistance, unlike chemical pesticides. While dehydration begins immediately, the time until death can range from hours to several days.
Essential Safety and Preparation Steps
Preparation begins with selecting the correct grade and prioritizing personal safety. Always choose food-grade DE for residential pest control, as industrial or pool-grade varieties may contain crystalline silica, which is hazardous if inhaled. Even food-grade powder is fine, and inhaling large amounts can irritate the lungs and respiratory tract.
To avoid irritation, wear protective gear, including a dust mask or respirator, safety glasses, and gloves. Use a bellows duster or bulb duster to puff the material into crevices and voids with precision, minimizing airborne dust and achieving the required thin layer. The powder must be kept completely dry, as moisture, such as rain or heavy dew, significantly reduces its effectiveness.
Strategic Application Techniques and Targeted Placement
The most crucial aspect of using DE is applying it as a fine, barely visible dust layer. Applying a thick pile is a common mistake, as scorpions may lift their bodies over it to avoid contact. The goal is to apply the powder so lightly that a scorpion cannot detect the barrier and is forced to walk through it.
For indoor placement, focus on hidden, undisturbed areas where scorpions travel or hide. Use a duster to puff the dust into wall voids, under sinks, behind baseboards, and into cracks and crevices where utility pipes enter the home. Also target basements, attics, and the gaps around door and window frames.
Creating an effective outdoor barrier requires treating the perimeter of the structure, as scorpions seek entry points. Apply a thin band of powder around the foundation of the home, ensuring the dust enters weep holes and cracks in the cement or masonry. Target areas like woodpiles, under rocks, and outdoor clutter that provides shelter. Pay specific attention to the gaps around the garage door frame and other ground-level entry points.
Monitoring and Maintaining the DE Barrier
Once applied, diatomaceous earth remains effective as long as it stays completely dry and undisturbed. Indoors, the powder can last for months, but cleaning or vacuuming requires reapplication. If applied to carpeted areas, leave the powder for two to three days before vacuuming it up using a HEPA filter or bag to minimize dust creation.
Outside, the barrier needs regular reapplication, especially after significant rainfall or strong winds. Moisture, including heavy morning dew, neutralizes the powder’s desiccant properties, requiring the area to dry completely before reapplication. Clean up dead scorpions or other pests safely to prevent attracting scavengers. Monitoring activity, possibly using a black light, helps determine if the treatment is working and reveals missed entry points.