Stink bugs are a common household nuisance, particularly as temperatures drop and they seek warmer indoor environments. These insects often infiltrate homes through small openings. Many homeowners seek natural pest control. Diatomaceous earth offers a non-toxic alternative for stink bug infestations.
Understanding Diatomaceous Earth
Diatomaceous earth (DE) is a naturally occurring, fine powder derived from the fossilized remains of diatoms, microscopic aquatic organisms. These ancient diatoms possessed hard shells composed primarily of silica. Over millions of years, these silica-rich skeletons accumulated in sedimentary deposits, which are now mined and processed into diatomaceous earth.
Diatomaceous earth functions as a mechanical insecticide. It works through its abrasive and absorbent properties. When an insect comes into contact with DE, the microscopic, sharp edges of the powder abrade and cut through the insect’s waxy outer layer, or exoskeleton. This damage leads to the absorption of oils and fats from the exoskeleton, causing the insect to lose body fluids and dehydrate. This physical action means insects cannot develop resistance to it, unlike many chemical pesticides.
Targeting Stink Bugs with Diatomaceous Earth
Applying diatomaceous earth involves strategic placement both indoors and outdoors. A thin, dry layer of DE is most effective, as pests tend to avoid thick accumulations, and moisture reduces its efficacy. It must remain dry to work, requiring reapplication after rain or heavy dew outdoors.
Indoors, focus on areas where stink bugs are likely to enter or congregate. Sprinkle a thin layer of food-grade diatomaceous earth around window sills, doorframes, and along baseboards. It can also be applied to cracks, crevices, and other small openings. A dust applicator can help puff the powder into tight spaces where stink bugs might hide.
Outdoors, create a barrier around the foundation of your home by applying a band of DE a few inches wide. This helps deter stink bugs from entering the structure. You can also sprinkle it around the base of plants in gardens and on leaves where stink bugs are observed feeding. This dual approach, addressing indoor entry points and outdoor populations, provides a comprehensive strategy.
Safe Handling and Use
It is important to select food-grade DE, processed to be safe for humans and pets. Other grades, such as filter-grade, may contain higher levels of crystalline silica, which can pose respiratory risks if inhaled. While food-grade DE is low in toxicity, caution is advised during application.
To minimize inhalation, wear a dust mask and gloves when applying DE. Though not harmful to humans or pets in small ingested amounts, inhaling the dust can irritate the respiratory tract. Apply DE in a well-ventilated area, and consider opening windows for good air circulation.
Strategically place the powder to avoid excessive exposure to children and pets in areas they do not frequently access. If accidental inhalation occurs and respiratory discomfort persists, seek medical attention. Diatomaceous earth is considered non-toxic and environmentally compatible, offering an alternative to chemical pesticides.