What Does a Bedbug Infestation Smell Like?
TL;DR — Quick Answer
Bedbugs release alarm pheromones creating a distinct musky, sweet, coriander‑like odour — earning them the nickname “Coriander Bugs”. You may also spot bites, shed skins, and dark faecal stains. DIY methods rarely work; professional treatment is needed to fully remove them.
What Is That Distinct Smell Linked to Bedbugs?
If you notice an odd, lingering scent in bedrooms or soft furnishings, it may be bedbugs. They release chemical alarm pheromones when disturbed or threatened.
People describe the odour as musky, sweet, sickly, or similar to fresh coriander, cilantro, or sometimes overripe raspberries. This earned them the nickname “Coriander Bugs”.
The smell is faint with only a few bedbugs — but becomes strong and unmistakable once an infestation grows. University of Sydney entomology notes it is often compared to stinkbug secretions, just milder and sweeter.
For a full inspection and scent identification, Contact Sydney’s Best Pest Control.
What Other Warning Signs Confirm a Bedbug Problem?
Odour alone is not proof — look for these matching clues together:
- Red, itchy bite marks often in lines or clusters on arms, legs, neck or face
- Dark rusty spots on sheets, mattresses or walls — bedbug faeces
- Pale shed skins left behind as nymphs grow larger
- Tiny eggs about 1mm long, pearly white, tucked into seams and crevices
- Live bedbugs around 5mm long, flat and oval, deep brown or reddish‑brown
A single female can lay up to 500 eggs over her lifetime. Populations can double in as little as 16 days if left untreated, per Journal of Medical Entomology data.
Where Do Bedbugs Hide and How Do They Get Into Sydney Homes?
Bedbugs are masters of hitchhiking and hiding. They cling to luggage, clothing, second‑hand furniture, and soft furnishings — then slip into gaps as thin as a credit card.
Common hiding spots include:
- Mattress seams, tufts and edges
- Behind headboards, skirting boards and picture frames
- Cracks in bed frames and bedside tables
- Under loose wallpaper and inside power outlet covers
NSW Health records show bedbug reports in Sydney rose by 28% between 2023 and 2025, linked to increased travel and second‑hand item trading.
Do DIY Methods Work to Remove Bedbugs?
No — DIY sprays, washes and home remedies almost never work fully. Bedbugs can survive for up to 12 months without feeding and quickly hide deep where treatments cannot reach.
Many store‑bought products only kill the bugs you can see, leaving eggs and hidden colonies safe to grow back. In Sydney, only licensed technicians can use the registered, residual treatments that target all life stages.
If you smell the coriander‑like scent or see any warning signs, call us on 1800 819 189 — we use NSW‑approved methods to eliminate the whole infestation.
Frequently Asked Questions
Can only strong infestations be smelled?
Yes — small numbers usually have no noticeable scent. A clear musky or coriander smell means you likely have a well‑established colony nearby.
Does mould smell like bedbugs?
Mould smells earthy, damp or musty, while bedbugs smell sweeter and more herbal. If you smell both, the bedbugs may be nesting in damp hidden areas too.
Can I just wash everything to get rid of them?
Hot washing (60°C+) and hot tumble drying kills bugs on fabrics — but they will survive on walls, frames and furniture you cannot put in the machine.
How quickly should I act if I smell bedbugs?
Book an inspection straight away — delays of just one week can let numbers grow enough to make treatment far more complex and costly.
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Suspect Bedbugs in Your Sydney Home?
Bed bug infestations can affect homes, apartments, hotels and businesses throughout Sydney. Because bed bugs are excellent at hiding in mattresses, furniture and small cracks, early detection is important.
Sydney property owners who notice unusual bedroom smells alongside bite marks, stains or other warning signs should arrange a professional inspection and treatment.