Sevin dust is a ready-to-use insecticide powder that kills insects on contact and continues to protect treated surfaces for several weeks after application. The active ingredient is carbaryl, a synthetic carbamate compound that disrupts the nervous system of insects and arachnids. GardenTech manufactures the current consumer Sevin line, which is sold under several product names and in several formulations. The dust form is the most widely used version for home gardens, lawns, and ornamental beds because it is applied without mixing, reaches into cracks and crevices that sprays cannot penetrate easily, and clings to leaf surfaces through light rain.
Homeowners commonly refer to Sevin dust as “seven dust,” “7 dust,” or “garden dust,” all of which describe the same category of carbaryl-based powder insecticide. The product has been available since the 1950s and remains one of the most widely used broad-spectrum insecticides for residential use in the United States.
What Is in Sevin Dust? The Active Ingredient
Carbaryl is the active ingredient in Sevin dust, and it belongs to the carbamate class of insecticides. Carbamate insecticides work by inhibiting acetylcholinesterase, the enzyme that breaks down acetylcholine in the nervous system. When an insect contacts carbaryl, acetylcholine accumulates at nerve synapses, causing continuous nerve firing, paralysis, and death. This mode of action makes carbaryl effective against a wide range of insects and arachnids, including both soft-bodied pests such as aphids and hard-bodied beetles.
Carbaryl is registered with the Environmental Protection Agency and carries the signal word CAUTION on the label, which is the lowest tier of toxicity classification for pesticide products in the US. The full active ingredient declaration on Sevin Insect Killer Dust reads “carbaryl: 5.000%,” with the remaining 95% comprised of inert carrier material that gives the product its powdery texture and allows it to adhere to plant surfaces.
Sevin dust does not contain glyphosate, diatomaceous earth, or any fungicidal compound in its standard formulation. It is a contact insecticide, meaning it kills insects that directly touch the treated surface, and it also provides residual control as the carbaryl breaks down slowly over several weeks under normal outdoor conditions.
Sevin Dust Formulations and Products
GardenTech produces several distinct Sevin formulations, and understanding the differences between them helps you choose the right product for your situation.
Sevin 5 Dust, also labeled as Sevin Insect Killer Dust, is the standard consumer product. It contains 5% carbaryl by weight and is the formulation most commonly found at garden centers, hardware stores, and online retailers. This is the product most people mean when they refer to Sevin dust, and it is the formulation used in all pest-specific and application guidance on this site.
A 10% carbaryl dust formulation was historically available for higher-intensity applications. Consumer availability of the 10% version has declined as the 5% formulation has become the standard for home and garden use. Some commercial and agricultural suppliers still carry 10% carbaryl dust products, though the labeling and use patterns differ from the standard GardenTech consumer product.
Sevin Sulfur Dust combines carbaryl with sulfur in the same product. The sulfur component adds fungicidal action alongside the insecticidal properties of carbaryl, making it useful where fungal disease and insect pressure occur together on ornamentals such as roses. The two active ingredients work independently, and the sulfur does not enhance or reduce the insecticidal effectiveness of carbaryl.
Sevin also produces liquid concentrate and ready-to-spray formulations that use carbaryl as the active ingredient. These liquid products cover larger surface areas more efficiently than dust but do not penetrate into soil or nest cavities the way dust does. The full comparison of when to use dust versus liquid spray is covered in the application guide on how to use Sevin dust safely and effectively.
Ortho produced a separate consumer product line under the Sevin name that has since been discontinued. Earlier versions of GardenTech Sevin products were also sold under Bayer branding before the consumer insecticide category was reorganized. The active ingredient, carbaryl at 5%, is identical across legacy and current formulations, which is why older product packaging and newer GardenTech packaging perform identically in the field.
What Insects Does Sevin Dust Kill?
Sevin dust controls more than 65 species of common garden, lawn, and household pests. The pest list registered on the Sevin Insect Killer Dust label includes ants, aphids, armyworms, bagworms, beetles, borers, caterpillars, chinch bugs, cutworms, earwigs, flea beetles, fleas, grasshoppers, grubs, gypsy moth caterpillars, harlequin bugs, Japanese beetles, lace bugs, leafhoppers, leafrollers, mealybugs, millipedes, mites, plant bugs, pillbugs, scales, silverfish, sod webworms, sowbugs, spider mites, spittlebugs, squash bugs, stink bugs, thrips, ticks, tomato hornworms, whiteflies, and yellow jackets. The full product label is the authoritative pest list and should be consulted before treating any crop or surface not covered here.
Sevin dust is particularly effective against ground-nesting stinging insects. Yellow jackets, bald-faced hornets, and other wasps that nest in soil cavities are controlled by applying dust directly to the nest entrance at night. The full method and timing for this application is covered in the Sevin dust for yellow jackets guide. For flea infestations in yards, the mechanism and timing of carbaryl dust application is covered in the Sevin dust for fleas and ticks guide. Ant control with carbaryl dust, including fire ants and carpenter ants, is addressed in the Sevin dust for ants guide.
For gardeners treating vegetable crops and ornamentals, the pre-harvest intervals, crop-specific timing, and safe washing guidance for edible plants are covered in the Sevin dust in the vegetable garden guide. Backyard chicken keepers using carbaryl dust to treat flocks for mites and lice will find egg withdrawal intervals and application method guidance in the Sevin dust for chickens guide.
There are several pests for which Sevin dust is not an effective primary treatment. Bed bugs are not listed on the Sevin label, and carbaryl dust does not penetrate the harborage areas where bed bugs shelter between feedings. Termites require a dedicated termiticide treatment program, and Sevin dust does not provide effective colony control or long-term structural protection against wood-destroying insects. If termites are present, the treatment options that actually work are covered in the termite control hub. Cockroaches can be killed by direct contact with carbaryl, but Sevin dust is not a labeled cockroach treatment and is not an effective strategy for roach infestations within structures.
Sevin dust kills bees on contact, which creates important pollinator considerations when applying it near flowering plants. The relationship between carbaryl and pollinators, including timing and application practices that reduce exposure to honey bees and other beneficial insects, is covered in the Sevin dust and bees guide.
Is Sevin Dust Organic?
Sevin dust is not an organic pesticide. Carbaryl is a synthetically produced compound that is not listed by the Organic Materials Review Institute (OMRI) and is not permitted for use in certified organic production systems. Gardeners managing a certified organic plot should not use Sevin dust or any other carbaryl-based product.
For home gardeners who prefer to avoid synthetic insecticides, diatomaceous earth is a naturally derived alternative that kills soft-bodied insects through physical action rather than chemical toxicity. A direct comparison of how the two products perform, including differences in pest range, application method, and safety profile, is available in the Sevin dust vs diatomaceous earth guide.
Carbaryl breaks down relatively quickly in soil and on plant surfaces compared to some older synthetic insecticides, with residual activity typically lasting two to four weeks under normal outdoor conditions. This degradation rate is faster in warm, humid environments and slower in cool, dry conditions. Faster breakdown does not make carbaryl organic; it simply means carbaryl is not a persistent compound in the same category as chlorinated insecticides from previous generations.
Does Sevin Dust Expire?
Sevin dust has a useful shelf life of approximately three years when stored correctly. Carbaryl degrades over time through hydrolysis, particularly when exposed to moisture, heat, and alkaline conditions. A product that has exceeded its shelf life may still contain some active carbaryl, but the concentration will be lower than the labeled percentage and pest control efficacy will be reduced.
Storing Sevin dust in its original sealed container in a cool, dry location away from direct sunlight extends the useful life of the product. Clumping, noticeable color change, and diminished odor are signs that the carbaryl has begun to degrade and the product should be disposed of according to local pesticide disposal guidelines. Applying degraded product does not meet the label use requirements and may result in insufficient pest control.
An unopened container of Sevin dust stored properly will typically remain within labeled specifications for three years from the production date. The production date is encoded on the container rather than displayed as a calendar date on most current packaging.
Can Sevin Dust Be Used Indoors?
Sevin dust is formulated primarily for outdoor use on gardens, lawns, ornamentals, and around the perimeter of structures. Indoor use is not the primary application for this product, and most consumer applications of Sevin dust take place outside.
Some limited indoor applications appear in older label versions, including treating specific areas for fleas in severe infestations. Current label language is the legal standard for pesticide use in all circumstances, and the label in hand should always be read before applying any pesticide product indoors. Products specifically formulated and labeled for indoor use are generally a more appropriate choice than carbaryl dust for pest problems that originate inside the home.
The safety profile of Sevin dust around children, pets, and wildlife is covered in two dedicated guides. The specific considerations for dogs and cats are addressed in is Sevin dust safe for dogs and pets, and the toxicity and exposure risks for humans are covered in is Sevin dust harmful to humans.
For full guidance on where and how to apply Sevin dust in gardens, lawns, vegetable beds, and around structures, the complete application guide is available at how to use Sevin dust safely and effectively.