If you are looking to control ants in the kitchen, cockroaches in a commercial establishment, fleas or bed bugs in a bed or sofa, crawling pests in a horticultural crop, or need an effective absorbent for oil or liquid spills in a workshop, without resorting to pyrethroids or neonicotinoids that leave chemical residues, natural diatomaceous earth is one of the few products that fulfills this physical insecticidal function without generating resistance in the pest. This guide explains how to identify the target pest, apply the product dry or in wet suspension, and protect health during the application of respirable dust, which is the only critical precaution for the product.
Diatomaceous earth consists of microscopic algae fossilized millions of years ago—a biogenic silica skeleton. Its insecticidal mechanism is physical, not chemical: the microscopic edges of the silica perforate the waxy cuticle of insects on contact and dehydrate them within hours. As a result, pests do not develop resistance (there is no active compound to mutate) and the product continues to work indefinitely as long as it is applied correctly.
Product Specifications
GARDESE diatomaceous earth is offered in a single standard presentation: natural uncalcined, micronized product, in a 20 kg bag. It is very important to respect the natural uncalcined version for insecticidal and agricultural use; calcined diatomaceous earth (crystalline silica) is much more dangerous by inhalation and is NOT used in these contexts. The following table provides the full technical specifications of the only available variant:
| Specification | Value |
|---|---|
| SKU | 571311 |
| Material | Biogenic silica (fossilized algae) |
| Treatment | Natural (uncalcined) |
| Granulometry | Micronized (fine powder) |
| Packaging | 20 kg (44 lb) bag |
| Color | White to light beige |
| Insecticidal mechanism | Physical (dehydration by cuticle abrasion) |
| Organic compatibility | Approved in organic farming standards |
| Absorbent capacity | High (multiple times its weight in liquids) |
| Shelf life | Indefinite if kept dry |
There are two forms of diatomaceous earth on the market and they are NOT interchangeable: natural uncalcined (this product) is amorphous silica, safe for agricultural and insecticidal use with the standard precaution for respirable dust. Calcined is heated to high temperatures and partially transforms into crystalline silica, which is much more dangerous by inhalation and classified as carcinogenic by the WHO. Calcined is used exclusively as an industrial filter medium (NOT in agriculture, NOT against household insects). Always verify that the product you buy is natural uncalcined for the uses described in this guide.
The companion guides for zeolite, expanded perlite, expanded vermiculite, and pumice cover the other mineral amendments in the catalog and help you decide which is best for each case depending on the required function.
Step-by-step guide for use
The following procedure covers the main uses: pest control in homes and agriculture, silicon supply in crops, and spill absorption. Safety measures for respirable dust are critical and are detailed in step 2.
Identify the target pest or use
Diatomaceous earth works against crawling pests (ants, cockroaches, fleas, bed bugs, ticks, earwigs) and flying pests when they land on the treated surface (aphids, thrips, plant lice). It is less effective against caterpillars, large larvae, and pests that do not come into direct contact with the dust. For agricultural use as a silicon supplement, dose 100-300 g per m² of crop depending on the species and need. For spill absorption in a workshop or garage, use enough to cover and completely absorb the liquid.
Personal Protective Equipment (PPE)
Diatomaceous earth dust is respirable and, although chemically inert, it irritates the respiratory tract by simple mechanical action if continuously inhaled. BEFORE applying, use a respirator with an FFP2 or N95 particle filter (common surgical masks are NOT sufficient), safety glasses, gloves, and long-sleeved clothing. If working indoors, ventilate the area well during and after application. Keep children and pets away from the area during application and until the dust settles (usually 30 minutes to 1 hour). Once settled, diatomaceous earth is safe.
Dry application for pest control
Apply the fine diatomaceous earth powder directly with a duster, modified salt shaker, or brush to areas where pests pass: perimeter of rooms, under appliances, wall cracks, corners, around pipes and damp areas, pet bedding, crevices where ants or cockroaches nest. The layer should be thin and visible (1-2 mm thick); more powder is not more effective and only increases waste. Diatomaceous earth works by contact: pests that cross it or land on it absorb dust into their cuticle and die from dehydration within hours or a few days.
Wet application for outdoor crops
For outdoor horticultural crops where wind can disperse dry dust before it fulfills its function, prepare a suspension with water: mix 50-100 g of diatomaceous earth per liter of water with a natural surfactant (a drop of potassium soap) to improve adhesion. Spray onto the foliage and soil of the crop with a backpack sprayer. When the water evaporates, a thin film of diatomaceous earth remains, which performs the insecticidal function without risk of inhalation for the applicator or dispersion by wind. Reapply after heavy rains that wash off the film.
For outdoor crop pest control with drip or sprinkler irrigation systems, combine wet diatomaceous earth application with irrigation directed at the root zone instead of the foliage. This keeps the diatomaceous earth on the foliage protected from irrigation wash-off, multiplying its effect daily without constant reapplication. This technique is standard in organic vegetable production for sucking pests (aphids, thrips) in crops such as tomatoes, peppers, lettuce, and cruciferous vegetables.
Reapplication and control maintenance
Diatomaceous earth loses effectiveness when wet: water does not destroy it, but the wet suspension does not have the mechanical abrasiveness of dry powder against the cuticle. Indoors, reapply every 2-4 weeks in areas with occasional moisture or if cleaning with water may have removed the dust. In outdoor crops, reapply after each heavy rain or sprinkler irrigation that may have washed the foliage. For pests with short generation cycles (fleas, bed bugs), consider reapplication every 7-10 days for 2-3 cycles to ensure interception of adults emerged after the first treatment.
Do not confuse NATURAL uncalcined diatomaceous earth (this product) with CALCINED diatomaceous earth. Calcined diatomaceous earth is heated to high temperatures and forms crystalline silica (cristobalite, tridymite), classified as carcinogenic by the WHO for chronic inhalation. Calcined diatomaceous earth is used exclusively as an industrial filter medium in treatment plants. If the label of the product you are considering says "calcined" or "food grade" without the word "natural," DO NOT use it for pest control in the home or in agriculture. GARDESE natural micronized diatomaceous earth is the correct version for the uses described in this guide.
Diatomaceous earth or zeolite for stable control?
Both amendments have different functions in livestock and pets: diatomaceous earth controls pests (fleas, ticks, mites) and absorbs moisture; zeolite absorbs ammonia and reduces odors. The combination of both in stable bedding and pet areas is common for comprehensive control. Ask the assistant with your scenario, and we will guide you to the correct dosage and combination.
Complementary Products
To complement diatomaceous earth in integrated pest control, organic agriculture, and industrial absorption, the following products cover the most common adjacent needs:
Zeolite is a natural complement in stables, pet litter, and humid areas: diatomaceous earth controls pests while zeolite absorbs ammonia and reduces odors; the combination provides comprehensive environmental control. Coconut fiber substrate is the ideal base to mix with diatomaceous earth in horticultural crops with recurring soil-dwelling pest problems. Weed control fabric reduces the habitat of crawling pests by eliminating the weeds where they hide. Expanded perlite in professional mixes is complemented by small fraction diatomaceous earth for silicon contribution and prevention of substrate fungi.
Maintenance and Care
Diatomaceous earth applied for pest control requires periodic reapplications depending on the environment: in dry environments, an application lasts weeks or months without losing effect; in humid environments or with frequent water cleaning, the reapplication frequency increases to 2-4 weeks. For agricultural use, observe the effect after 7-10 days of the first application: if pest pressure has decreased but not been eliminated, reapply after watering and allowing to dry.
For storage of unopened bags, keep the bag in a DRY place under cover. Environmental humidity does not destroy diatomaceous earth but forms clumps that make application with a duster or sprayer difficult. If the powder becomes slightly damp, dry it by spreading it on a tray in the sun or in a low oven (60°C) for one hour before applying. For partially used bags, seal with wide adhesive tape. Diatomaceous earth does not expire and can be used for years without loss of effectiveness as long as it is kept dry.
Frequently Asked Questions (FAQ)
Is diatomaceous earth safe for pets and children?
Uncalcined natural diatomaceous earth is physically and chemically safe for mammals upon skin contact and small ingestion (it is not toxic). The only critical risk is inhaling the dust during application: respirable dust irritates the airways. Keep children and pets away during application and until the dust settles (30-60 minutes). Once settled on the surface, diatomaceous earth is completely safe. For use in pet bedding or flea treatment in dogs and cats, use only the NATURAL uncalcined version and apply with the pet outside the area, allowing them to re-enter after the dust has settled.
Can I use diatomaceous earth against cockroaches and ants in the kitchen?
Yes, it is one of the most effective uses of the product. Apply in thin lines behind appliances, under the sink, in cracks between furniture and walls, in the corners of drawers (under decorative paper), and in pest transit areas. Keep food preparation surfaces free of dust —diatomaceous earth is not toxic if accidentally ingested, but it creates a gritty sensation and is unpleasant—. Pests that pass through treated areas absorb dust into their cuticles and die from dehydration within hours or a few days. Efficacy is greater in dry environments.
When will I notice the effect against a pest?
For individual pests that come into contact with diatomaceous earth, the effect is from hours to a few days: dehydration due to cuticle abrasion is not instantaneous like a chemical pyrethroid, but it is inevitable and without the possibility of resistance. For established infestations, wait 1-2 weeks to assess a significant reduction in the number of visible individuals. If the pest persists after 2-3 reapplications, evaluate whether it is coming from an untreated external source or if it requires combination with another strategy (ant baits, elimination of food and water sources for cockroaches, high-temperature washing of fabrics for bed bugs).