# Khapra beetle (Trogoderma granarium) > A tiny, highly destructive stored-grain pest whose hairy larvae survive long periods without food and are very hard to eradicate. Source: https://insectscanner.com/species/khapra-beetle/ (updated 2026-10-10) ## Is it dangerous? **Allergen risk.** Khapra beetles are not venomous or dangerous, but the dense larval hairs and shed skins can cause allergic reactions or skin irritation in sensitive people and may aggravate asthma. If large infestations contaminate food, the product should be discarded. Use gloves and a mask when cleaning heavy infestations to avoid inhaling dust and hairs. **Pets:** Contaminated food may upset pets' digestion; the beetles are not known to be toxic to pets but infested food should be thrown out. ## Quick facts - Scientific name: Trogoderma granarium - Also called: Khapra - Order: Coleoptera (Beetles) - Family: Dermestidae (Skin beetles) - Size: 1.5-3 mm long - Colours: Reddish brown, Dark brown, Pale cream (pupa) - Habitat: Dry stored products and structures storing grain, processed cereals, seeds, dried food, packaging, mills, warehouses, cargo holds - Range: Native to South Asia; established in hot, dry parts of South and Central Asia, the Middle East and Africa, and repeatedly intercepted in shipments worldwide. Many countries, including the United States, Canada, Australia and EU members, treat it as a quarantine pest and eradicate any outbreaks. - Active: Year-round in heated or warm storage; activity and reproduction peak at higher temperatures (roughly 25-40 degrees C) - Lifespan: Adults live several weeks; larvae can live many months to over a year under cool, dry conditions - Effect on plants: Stored-product pest - Pest: yes ## Overview Trogoderma granarium (khapra beetle) is a small dermestid beetle specialized on dry stored products, especially cereal grains, seeds and processed foodstuffs. It is regarded as one of the world’s most serious quarantine pests because infestations can rapidly reduce food quality and quantity and trigger strict trade restrictions. The larvae, not the adults, cause most of the damage; they feed on grain kernels, flour, dried goods and packaging, and can persist for long periods in cracks and equipment. The species prefers hot, dry conditions and is most damaging in warehouses, mills, ship cargoes and grain stores. Many countries maintain strict surveillance and eradication programs when an infestation is detected because T. granarium spreads easily with traded goods and is difficult to eliminate once established. ## How to identify it Adults are small, oval, and rounded, about 1.5-3 mm long, reddish-brown to dark brown and lightly covered with fine hairs. Wing covers (elytra) are smooth or faintly punctured. Larvae are the distinctive stage: densely covered with long, often erect hairs, tapered at the rear, and typically pale brown to dark brown; mature larvae are several millimetres to about 5-6 mm long depending on nutrition and conditions. Pupae are cream-coloured and found in protected cracks or debris. Infested grain often contains many shed larval skins and fine frass. Adults have wings but rarely if ever fly. - Look for dense, long hairs and tapered rear on larvae; shed larval skins in grain are a key sign of infestation. - Adults are small (1.5-3 mm), reddish to dark brown and oval; finding adults alone may indicate presence but larvae do most damage. - Use pheromone traps and inspect dust, cracks, machinery and corners of storage rooms for larvae and skins. - Infested product contains many cast larval skins, hairs and powdery frass, and kernels may be hollowed or chewed. ## Lookalikes - **Warehouse beetle** (Trogoderma variabile): Warehouse beetle larvae are similar but usually less hairy and the species tolerates cooler climates; identification by experts or microscope may be needed. - **Carpet beetle** (Anthrenus spp.): Carpet beetle larvae are also hairy but are typically found in fabrics and carpets; T. granarium is primarily a stored-product pest and larvae have a distinctive tapered rear with longer tufts. ## Life cycle - **Egg:** Females lay small, sticky eggs in cracks, kernels and among stored products; eggs hatch in a few days to a couple of weeks depending on temperature. - **Larva (hairy grub):** Larvae feed on dry foodstuffs and cause most damage. They are densely hairy, go through several molts, and can enter diapause to survive long starvation periods. - **Pupa:** Larvae pupate in protected sites such as crevices or inside damaged kernels. Pupation lasts days to weeks depending on temperature. - **Adult (beetle):** Adults are short-lived compared with larvae, do not cause significant feeding damage, and are responsible for dispersal and egg-laying. ## Diet and predators - Young eat: Dry plant products: cereal grains, flours, pasta, pulses, dried fruits, spices, animal feeds and other dry stored products; larvae can also consume packaging and dead insects. - Adults eat: Adults feed little and cause little damage; they may nibble stored products but main impact is from larvae. - Predators of the young: Natural enemies include certain parasitoid wasps and predatory beetles in storage environments; however, in sealed stores their survival is limited. - Predators of adults: Predatory beetles, spiders and small predators can eat adults where accessible, but natural control in bulk storage is usually insufficient. ## Effect on plants and gardens Does not attack living plants; damages stored plant products such as cereal grains, pulses, dried fruits, flours and processed foods, reducing quality and marketability. ### How to get rid of it Prevent entry by inspecting and cleaning incoming grain and packaged goods. Maintain good sanitation: remove spilled grain and residues, clean cracks and equipment. Keep storage dry and, where possible, cool; low moisture and temperatures slow development. Use monitoring traps (pheromone traps) to detect infestations early. For active infestations, fumigation, heat treatment (e.g., raising internal temperature of bulk grain to lethal levels), or approved insecticidal treatments by licensed pest controllers are commonly required. Because khapra beetle is a regulated quarantine pest in many countries, report findings to local plant protection authorities; do not move infested material. Professional eradication is often necessary. ## Where and when to find it Inspect grain bulks, sacks, bins, mill machinery, corners, crevices and packaging. Look for larvae, shed skins, frass and webbing. Adults may be found on surfaces near infested food. - Best time: Year-round in heated storages; most active and reproducing when temperatures are warm (roughly 25-40 degrees C). - Tips: Use pheromone traps to detect low-level infestations. When inspecting bulk grain, sample from different depths and edges. Wear a mask when examining heavily infested material to avoid inhaling dust and larval hairs. ## Fun facts - Khapra beetle is one of the world's most dreaded stored-product pests and is subject to strict quarantine controls in many countries. - Larvae can survive long periods without food by entering a dormant state, making eradication difficult. - Infestations are often detected by the presence of shed larval skins and frass rather than live adults. ## Frequently asked questions ### Is the khapra beetle dangerous to people? Only mildly. It has no venom and does not bite, but larval hairs and dust can cause allergic reactions or respiratory irritation in sensitive individuals; contaminated food should be discarded. ### Do khapra beetles eat grain? Yes — the larvae feed on cereal grains, flours, pulses and many dry stored products and can cause severe losses. ### Why do I find khapra beetles in my house? They are rare in homes. If found, they most likely arrived in imported dry foods, grain, seeds or spices. Because it is a regulated quarantine pest in many countries, keep a specimen and report it to your national plant protection or agriculture authority. ### How do I get rid of khapra beetles? For small household infestations, dispose of contaminated food, vacuum thoroughly, clean storage areas and use airtight containers. For commercial or large infestations, contact local plant protection or licensed pest control for measures such as fumigation or heat treatment; khapra beetle is a regulated pest in many countries. ### Can khapra beetles survive cold winters? They prefer hot, dry conditions; cold temperatures slow development and can kill individuals, but eggs and larvae in protected, heated storage can survive year-round. --- More about this species: [iNaturalist](https://www.inaturalist.org/taxa/209160), [Wikipedia](https://en.wikipedia.org/wiki/Khapra_beetle). Identify insects and spiders from a photo with the Insect Scanner iPhone app: https://apps.apple.com/app/id1543946563?pt=126685406&ct=web-markdown&mt=8 Identification from photos is never certain: don't handle insects you can't identify, and get medical advice for bites, stings or allergic reactions.