Category: Insects

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The best mosquito repellent for most people is a skin repellent containing DEET, or icaridin if you would rather avoid DEET. Those are the active ingredients that government travel-health guidance puts first, and nothing sold as a gadget comes close to them. Indoors, the strongest set-up is simple: screens on the windows, a knockdown spray for any mosquito that slips in, and a plug-in vaporiser in the bedroom on warm nights. Outside, the most effective step costs nothing at all: get rid of standing water so mosquitoes can’t breed in the first place.

What doesn’t earn its place? Ultrasonic buzzers, phone apps, garlic and vitamin B tablets. And the popular UV bug zapper, while useful for flies, catches surprisingly few mosquitoes. Below we explain why, and which product type suits each job. Our recommendations are based on product labels and published official guidance, not hands-on testing.

Quick Picks

Match the product to the problem. Most households need a skin repellent plus one or two items for the house.

Skin Repellents: DEET, Icaridin and Lemon Eucalyptus

A repellent on your skin is the only product here that stops the mosquito biting you personally, wherever you are. Biting female mosquitoes home in on the carbon dioxide we breathe out and then on body odour, so the job of a repellent is to make you a confusing, unattractive target at close range.

DEET

Government malaria-prevention guidance for travellers recommends a 50% DEET product as the first choice. It also notes that protection doesn’t last any longer above 50%, so stronger isn’t better. DEET is described as suitable for anyone over two months old unless they’re allergic, and the same guidance says 50% DEET is considered safe in pregnancy and while breastfeeding. For a midge-and-mosquito evening in the garden, many people use a lower strength; the trade-off is a shorter protection time, which the label will state.

Two practical points. Reapply after swimming or heavy sweating, because sweat shortens how long it lasts. And if you need sun cream too, put the sunscreen on first and the repellent second. DEET can reduce how well sunscreen works, which is why the guidance suggests a higher factor, SPF 30 to 50.

Icaridin (picaridin)

If DEET doesn’t suit you, the official advice is to use the strongest icaridin product you can find, typically 20%. It is a sensible pick for anyone who simply prefers not to use DEET. Check the label for the age it is approved from and how often to reapply.

Lemon eucalyptus (citriodora)

Refined lemon eucalyptus oil, listed on packs as citriodora or PMD, is the plant-derived ingredient the guidance names as an alternative to DEET, again at the highest strength available. Note that the guidance names the processed oil (described as hydrated and cyclised), not the raw essential oil you might find in an aromatherapy shop, so buy a product sold and labelled as an insect repellent.

Keeping Mosquitoes Out of the House

Indoors, think in layers. First stop them getting in, then deal quickly with the ones that do, then protect the room where you sleep.

Screens and nets

Fine-mesh fly screens for windows and doors let you keep windows open on warm evenings without inviting mosquitoes in. Where you’re sleeping somewhere without screens, or outdoors, the travel guidance recommends a bed net, checked for rips and tucked in under the mattress.

Knockdown sprays

The same guidance suggests spraying the bedroom with a knockdown insecticide before dusk to kill any mosquitoes that came in during the day. Our shop’s Raid Plant-Based Wasp and Mosquito Killer Spray is a 300ml indoor aerosol whose label covers flies, mosquitoes, wasps and moths. It is a tool for the odd insect you can see, not a substitute for screens (see it on Amazon). Ventilate the room afterwards as the can directs.

Plug-in vaporisers

A plug-in heated liquid device containing insecticide is the guidance’s suggestion for overnight protection where you have mains power. Choose one approved for domestic use and read the label for room size and ventilation advice.

Cutting Mosquito Numbers in the Garden

There are more than 30 native mosquito species in the British Isles, according to the government’s health security agency. Some only bite birds and many live in places like salt-marsh or wet woodland, but several breed happily in garden water and some of those bite people. Removing that water is the single best way to reduce nuisance bites at home.

• Water butts: a common breeding site. Fit a tight lid; a water butt mesh cover is cheap insurance.
• Gutters and drains: keep them clear so water drains away rather than pooling.
• Buckets, tarps, tyres and wheelbarrows: store or tip them so rain runs off.
• Paddling pools and bird baths: drain and refill every few days so larvae can’t develop.
• Ponds: leave a healthy, established pond alone. It attracts predators that help keep mosquito numbers down.

Do Bug Zappers Kill Mosquitoes?

Not many. Mosquitoes find people by scent and breath, not by UV light, so a lamp is a poor lure for them. A ten-week University of Delaware study of suburban zappers, summarised by a Californian mosquito control district, found that mosquitoes made up less than 0.25% of more than 13,000 insects killed. Most of the rest were beetles, moths and other harmless insects.

That doesn’t make zappers useless. For houseflies and moths in a kitchen, garage or conservatory they do a decent job, which is why we cover them in our best electric fly killers guide. If that’s the problem you’re solving, the 18W Electric Bug Zapper (view on Amazon) or the dusk-to-dawn GeckoMan Hybrid Spectrum Fly Zapper (view on Amazon) are sensible options from our range. Just don’t rely on either as your mosquito defence; pair it with a skin repellent.

What Doesn’t Work

A lot of money goes on mosquito products that official guidance specifically rejects:

• Ultrasonic buzzers: the travel guidance calls electronic buzzers completely ineffective as mosquito repellents. We look at the wider claims in do ultrasonic pest repellers actually work?
• Phone apps: apps that claim to keep mosquitoes away are strongly discouraged.
• Garlic and vitamin B: there is no evidence that eating garlic or taking vitamin B1 or B12 stops bites.
• Citronella: it does have some repellent effect, but it isn’t among the recommended options and doesn’t match DEET or icaridin.

The common mistake behind all of these is choosing convenience over contact. A repellent works because it is on your skin, right where the mosquito lands.

When to Call a Professional

For most homes, mosquitoes are a seasonal nuisance that the steps above handle. Call a qualified pest controller if you have persistent biting indoors with no obvious source, a breeding site you can’t safely reach or drain, such as a blocked flat roof or a neglected tank, or you run a business where insects are a hygiene or customer issue. A professional can find where larvae are developing and treat it with products not sold to the public.

If you spot an unusual striped mosquito, or you’re being bitten heavily during the day, it is worth reporting. The health security agency runs a mosquito surveillance scheme and accepts records and samples from the public. And see a GP or pharmacist about any bite that becomes very swollen, painful or infected.

Frequently Asked Questions

Sources: Government malaria prevention guidelines for travellers: bite prevention; Health Security Agency: Controlling mosquitoes in your garden; San Gabriel Valley Mosquito and Vector Control District: are bug zappers effective against mosquitoes?.

Some links below are affiliate links. Our recommendations are based on product labels and published guidance, not hands-on testing.

The best wasp trap is a reusable bait trap hung away from where you sit, and the best nest killer is usually a professional visit. Traps cut down the wasps bothering your patio table, but they do not remove the nest. Shop-bought nest sprays do, yet a nest is a risky thing to tackle yourself.

This guide compares the main options: bait traps, scent deterrents, decoy nests and nest treatments. It also explains the timing, because wasp products work very differently in July than they do in November.

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When Wasp Products Actually Matter

According to the Royal Horticultural Society, a wasp colony starts in spring when a lone queen builds a small nest and raises her first workers. By late summer a nest can hold 400 to 500 workers. In autumn the colony dies out, and only the young queens survive the winter, sheltering in outbuildings or under loose bark. Nests are not reused the following year.

That has a practical meaning. Wasps become a nuisance from late summer, when workers go looking for sugary food such as ripe fruit, drinks and bins. If you are reading this in the colder months, there is nothing to trap right now, and a nest you can see is probably already empty. Buying in advance for next season is the sensible move.

Wasp Traps Compared

A bait trap draws wasps in with a liquid lure through a funnel they struggle to escape. The reusable designs in our wasp control range let you see when the trap is full and empty it for the next round.

Reusable bait traps

The two-pack of reusable traps uses an hourglass shape and a liquid bait, either a shop-bought attractant or a homemade sweet mix. It suits an outdoor eating area where you want fewer wasps near the table. You can buy it through this Amazon listing.

The three-pack of hanging traps has twin funnel entrances and can hang from a branch or stand on a table, indoors or out. A pack of three means you can cover a few spots. See it on Amazon.

Where to put them

Hang traps a few metres away from where people sit, not on the table itself. You want to pull wasps toward the trap and away from your food. Keep them out of reach of children and pets, and empty them wearing gloves.

Do traps reduce the nest?

This is the honest limit. The Royal Horticultural Society says it is unclear whether commercial traps reduce local wasp numbers or simply draw in wasps from further away. Treat a trap as a way to ease the pressure around one spot, not as a cure.

A homemade jam jar trap, half-filled with water and jam and covered with pierced paper, also works according to the Royal Horticultural Society. Reusable traps are neater and less likely to spill.

Deterrents and Decoy Nests

Scent deterrent balls

The ten-pack of hanging balls releases a cinnamon and garlic aroma that wasps tend to avoid, and it works well near seating and sheds as a gentle, non-lethal measure. It is on Amazon here. We would not rely on any scent alone for a busy nest close to the house.

Decoy nests

Decoys use the idea that wasps avoid building near another colony. The Waspinator decoy nest is the best known, and there is a budget two-pack of decoys too. You can see them on Amazon and here.

Be realistic about the evidence. One pest-control educator quoted by Hunker says decoys may have limited success with territorial paper wasps but will not deter yellowjackets or hornets, and results are “hit or miss”. They are preventive only: hang one before wasps start building in spring, not after a nest is established.

Nest Killers: What to Know First

Nest treatments come as aerosol sprays and insecticidal dusts. We do not stock one in the shop, but you can See our top pick on Amazon and insecticidal powders.

If you go the DIY route, check the label for the active ingredient and exact instructions, and wear protective clothing. The British Pest Control Association points out that its members use specialist products that the public cannot buy, which is one reason professional treatment is more reliable.

For a fuller look at the choice, read our guide on wasp nest removal: DIY or professional.

Common Mistakes

• Putting the trap on the table. It draws wasps straight to your food. Place it well away from people.
• Setting traps too early or too late. Before late summer there is little sugar-seeking activity, and by late autumn the colony is dying anyway.
• Swatting near a nest. Waving arms and swatting tends to provoke defensive stings. Stay calm and move away.
• Blocking a nest entrance. It can send wasps looking for another way out, sometimes into the house.
• Treating a harmless nest. A nest in a quiet spot may need nothing at all.

When to Call a Professional

The British Pest Control Association advises getting help when a nest is in a busy area, and notes that wasps are best left alone where possible. Late in the season, worker wasps feeding on fermented fruit can be more irritable and more likely to sting.

Call a BPCA member for any nest in a roof, wall or near a door, or if you or a family member has had a serious reaction to a sting. If someone is stung, the NHS says to scrape out the stinger sideways rather than using tweezers, wash the area and apply a cold pack. Call 999 for swelling of the lips, mouth or throat, difficulty breathing, or collapse, and call 111 or see a GP if the person was stung more than once or has had a serious allergic reaction before.

Frequently Asked Questions

Sources: Royal Horticultural Society: Wasps · British Pest Control Association: wasp advice · NHS: insect bites and stings

Related reading: best electric fly killers for the home.

Affiliate note: some links below are Amazon affiliate links, so we may earn a commission if you buy through them. Recommendations are based on product labels and published guidance, not hands-on testing.

The short answer: an electric fly killer is worth buying if flies keep drifting in through a door or you want to cover a patio, but it will not fix a fly problem on its own. Pick a unit that matches where it will live (indoor-sheltered or outdoor), hang it between the entry point and the room you want to protect, and keep it well away from food.

Below we compare the electric options we stock against the cheaper alternatives, explain how to place them, and flag the point where a sticky trap, a spray or a professional is the smarter choice. Your kitchen is a different case from your garden, so we treat them separately.

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How Electric Fly Killers Work

Most units use an ultraviolet tube to draw flying insects in. Once they get close, they either hit an electrified grid or stick to a glue board, depending on the design. Council food-hygiene guidance describes both types, and notes that the tubes lose effectiveness before they stop glowing, so a lit tube does not prove the unit is still doing its job.

The unit sets the insects’ attraction against everything else in the room. Windows, lamps and TV screens all compete with the UV light, so a zapper in a bright room will catch fewer flies than one in a dimmer hallway. That is the main reason two households can report very different results from the same product.

Zapper grid versus glue board

A grid zapper kills on contact, and you will usually hear it. A glue-board unit is quieter and keeps the insects stuck in one place, which is why they are common in commercial kitchens. The products we stock are grid zappers, so they suit garages, porches, conservatories and sheltered patios better than a food preparation area.

The Products We Recommend

PKBD 20W Electric Fly Zapper

This is the simplest set-up of the group. According to the listing it has a 20W bulb with a 4,000V grid, a light sensor that switches it on at dusk and off at dawn, IPX4 splash resistance for sheltered outdoor use, and a hanging hook with a 3m power cord. The maker rates it for areas up to about 160 square metres. It suits a patio or garden room where you want something that runs itself. Check it on Amazon.

18W Electric Bug Zapper

A mid-sized lamp with 360-degree UV light, so insects approach from any side, and it can hang or stand on a table. The listing gives a 4,200V grid and a bulb life of up to around 8,500 hours, plus IPX4 splash resistance. If your main complaint is mosquitoes and flies on summer evenings, this is the one to look at first. Check it on Amazon.

Sticky strips, fruit fly traps and spray

Electric is not always the answer indoors. Sticky fly strips have no grid and no mains power, so you can put them near a window or back door without worrying about debris landing on a worktop. Fruit fly bottle traps work on a different principle: they use a bait that smells like overripe fruit, so they pull fruit flies away from the bowl and bin, which a UV light would not do. For a single fly in the room, a quick-knockdown aerosol such as Raid Plant-Based Wasp and Mosquito Killer (Amazon) is often faster than any trap. Always follow the label, keep it away from food and pets, and ventilate the room.

If you want a plug-in glue-board unit for a utility room or garage, you can also browse our fly killer range.

Where to Put One (and Where Not To)

West Lothian Council’s electronic fly killer guidance is clear on the principles, even though it is written for food businesses. Place the unit between the likely entry point and the area you want to protect; just inside and above the main door is often a good spot. Keep it away from bright windows and other light sources. And do not mount it over or close to food preparation areas, so insect fragments cannot land on food or surfaces.

At home, that translates to a hallway, porch, garage or utility room rather than the kitchen counter. For a patio, hang the unit a few metres from where you sit rather than right beside your chair, so you draw insects away from you rather than towards you.

What Doesn’t Work: Common Mistakes

Expecting a zapper to cure a breeding problem. BPCA advice ties fly problems to refuse and hygiene. Keep bins away from doors and windows with tight-fitting lids, dispose of rubbish promptly, cover food and fit fly screens. A fly killer deals with the adults; it does nothing about whatever is producing them.

Putting it in the brightest spot. A unit next to a sunny window is competing with daylight. Move it to a darker position that still sits on the insects’ route in.

Forgetting the maintenance. A zapper with a tired tube and a clogged grid looks fine but catches little. Our product pages list bulb life, but the safest assumption is an annual replacement.

Using it as a mosquito shield. Zappers attract many insects, not only the ones that bite, so you may see a full tray and still get bitten. If mosquitoes are your priority, combine it with removing standing water and using a repellent.

If you are also dealing with larger overwintering flies, see our guide to the best cluster fly killers and traps.

When to Call a Professional

Call a trained pest controller if flies keep returning after you have sorted the bins and food waste, if you see large numbers of maggots or flies appearing from a wall, ceiling or loft, or if you run a food business. BPCA advice for persistent infestations is to use a trained professional, and you can search for a local BPCA member. In a commercial setting, ask the pest control contractor to site and service the units, because grid servicing and wiring changes should be left to qualified people.

Frequently Asked Questions

Sources: BPCA: Fly control · West Lothian Council: Electronic fly killers (FH08)

Some links below are affiliate links. Our recommendations are based on product labels, listing details and published pest-control guidance, not hands-on testing.

If you want one answer: gel baits and bait stations are what actually clear a cockroach problem, because roaches carry the bait back to their hiding places and other roaches pick it up there. Sticky traps are useful, but mainly as monitors that tell you where the roaches are and how many there are. They rarely solve an infestation on their own.

This guide explains the difference between the main product types, which ones suit which situation, and how to place them so they work. We also cover the mistakes that make people think a product has failed when it was simply used in the wrong place.

Traps vs Baits: What Each One Does

These products get lumped together, but they do different jobs. A sticky trap is a card or tray with glue that catches roaches as they walk across it. A bait is a food-based product containing a slow-acting insecticide. The roach feeds, wanders back to its harbourage and dies there, and other roaches that feed on its droppings or remains can take in a dose too. That knock-on effect is why baits can reach roaches you never see.

Bait comes as a gel you apply into cracks, or as a sealed plastic station you simply place on the floor. Both rely on roaches finding the food attractive, so they work best when you have cleaned up other food sources first.

Our Picks by Situation

You can browse everything we list for this pest on our cockroach control products page.

Gel Baits: Why Professionals Prefer Them

The British Pest Control Association describes gel baits as the preferred approach over sprays for cockroaches. The gel is applied in small dots into the cracks and crevices where roaches shelter, and the bait stays palatable for a long time. Roaches that feed return to their hiding place, and the effect can spread through the group, though full control can take weeks rather than days.

Gels are also placed precisely, which keeps the product out of reach of children and pets when you apply it into gaps, hinges and the backs of cupboards rather than leaving it open. If you want to try one, search cockroach gel bait on Amazon and read the label for the active ingredient and the pack’s stated indoor use. Professionals also rotate between different active ingredients over time, because repeated use of the same one can leave you with roaches that are less susceptible to it. Switching brand while keeping the same active ingredient does not solve that.

Bait Stations

Bait stations are small enclosed plastic discs or boxes with bait inside. Roaches enter, feed and leave. They are the easiest option for most households, because there is nothing to measure and nothing to smear. The 96-pack of roach bait stations we list, for example, is aimed at people who want to treat several rooms, outbuildings or a whole property over time rather than just one kitchen corner. You can read the full details on the Amazon listing.

The 48-pack cockroach repellent pods are a similar idea in a smaller format. The listing describes a formula that roaches carry back to their hiding spots, and it is designed to be tucked along walls, under appliances and into corners. As with any product, treat the claims on the listing as the manufacturer’s description and check the label before you buy.

Sticky Traps and Monitors

BPCA guidance is clear that sticky traps are useful for monitoring, not for controlling an infestation. That does not make them pointless. Placed flat against walls overnight, they show you which species you have, how big the problem is, and which rooms are worst. That information tells you where to put your baits.

A pack such as the 6-pack of pre-baited cockroach traps is a reasonable way to do this, and it is non-toxic when used as directed. Number the traps or note their positions, check them every few days, and write down what you find. If the catches fall steadily after you start baiting, the treatment is working. If they do not, move the bait or call in help. You can see this trap on its Amazon page.

What About Sprays?

Professional guidance tends to favour baits over sprays for treatment, partly because sprays can scatter roaches into new areas. A contact spray still has a place for roaches you can see, such as one in the middle of the kitchen floor. The cockroach killer spray we list is described as a pesticide-free contact spray for visible roaches, which means it deals with the one in front of you rather than the hidden colony. See it on Amazon. Use it as a supplement to baits, not a replacement, and avoid spraying near your bait, because it can put roaches off feeding.

Where to Put Traps and Baits

Roaches are nocturnal, like warmth and moisture, and squeeze into very narrow gaps. BPCA advice lists the warm, humid spots behind ovens and fridges, around boilers and pipes, under sinks, and near laundry appliances as the usual hot spots. Put baits and monitors there first.

• Behind and under the fridge and cooker: warm, with food debris.
• Under the sink and around pipework: moisture and shelter.
• Cupboard corners and hinges: tight gaps that roaches use as runways.
• Near bins and bathroom drains: damp spots, particularly for the larger Oriental cockroach.

Two species are most common in homes: the German cockroach, around 10 to 15mm and light yellow-brown with two dark stripes behind the head, and the larger, darker Oriental cockroach, around 20 to 24mm. Knowing which you have helps, since German roaches favour warm kitchens while Oriental roaches prefer cool, damp places such as basements and drains.

Common Mistakes That Make Baits Fail

• Leaving other food available. If crumbs, pet food and open bins are still there, the bait has to compete. Clean thoroughly first, and keep bins covered.
• Not fixing the damp. A dripping pipe under the sink supplies water. Repair leaks.
• Using too few baits. Place them close to where roaches shelter, not in the middle of the room.
• Giving up early. The effect is delayed by design. Expect weeks, not days, and keep monitoring until activity stops.
• Mixing in sprays and cleaning products around the bait. Residues can deter feeding.
• Skipping the gaps. Seal gaps around pipes, doors and skirting once the roaches are gone, so new ones cannot move in.

For a wider plan beyond products, see our guide on getting rid of cockroaches in the kitchen.

When to Call a Professional

Honestly, cockroaches are one of the pests where DIY often falls short. BPCA advice for any cockroach infestation is to use a professional pest controller, ideally a BPCA member, who can survey the property, trace the harbourages and use products that are not sold to the public. If you see roaches in daylight, find them in several rooms, share walls with flats or takeaways, or see no improvement after a few weeks of baiting, get a quote. Anyone running a food business should have a proactive pest plan rather than relying on shop-bought products.

Frequently Asked Questions

Sources: BPCA Pest Aware advice sheet on cockroaches; PPC Online, BPCA A-Z of pests: cockroach control; BPCA: formulation focus for gel bait performance.

Affiliate note: some links below are Amazon affiliate links, so we may earn a commission if you buy. Our picks are based on product labels and published guidance, not hands-on testing.

A bed bug spray can help, but it will rarely clear an infestation on its own. The sprays worth considering are a plant-based option such as EcoVenger or an insecticide-based one such as Zero In, and the sensible way to use either is alongside hot washing, vacuuming and monitoring traps. If you have a confirmed, established infestation, the NHS and local councils both point towards professional help.

This guide compares the two sprays we stock, explains what a spray can and cannot reach, and shows how interceptor traps tell you whether your treatment is actually working. If you are still working out what you are dealing with, start with our wider guide on how to get rid of bed bugs.

Quick Picks

What a Bed Bug Spray Can and Can’t Do

Bed bugs are small, flat, reddish insects, roughly 6mm long as adults. By day they tuck themselves into crevices in bed frames, furniture and skirting boards, then come out at night to feed. A spray only works where it lands, so the first limit is simple: if the product does not reach the insect, it does nothing.

The second limit is resistance. The British Pest Control Association notes that bed bugs have become resistant to many pesticides, which is one reason professionals often rely on heat or on carefully chosen products. Local council guidance goes further and says that spraying insecticide around the bed alone will not remove an infestation.

So what is a spray good for? It is a useful tool for treating the hiding places you can see and reach, such as bed frame joints, the edges of the mattress seams, and skirting board gaps, as part of a wider plan. Think of it as one layer, not the whole answer.

Plant-Based Spray: EcoVenger

EcoVenger Bed Bug Killer Spray is a 480ml ready-to-use spray with a plant-based formula. Its listing says it targets adults, nymphs and eggs, kills on contact, and keeps working for a short while after drying. It is also described as designed for bed bugs that resist some traditional pesticides.

Who it suits

People who would rather avoid conventional pesticides in the bedroom often start here. It is also a reasonable choice for a first, small-scale response, for example when you have found a few insects and want to treat the bed frame while you wait for a professional survey.

What to keep in mind

Contact-kill sprays need to touch the insect, and the residual period on this type of product is short. That means you may need to repeat applications according to the label, and you should not treat it as a one-off cure. You can check the current listing on Amazon for the full directions before you buy.

Insecticide Spray: Zero In

Zero In Bed Bug and Dust Mite Killer Spray is a 500ml water-based, ready-to-use spray. Its product title claims up to 12 weeks of protection, and its description says it combines an insecticide with an antibacterial agent. Treat that 12-week figure as the manufacturer’s claim under ideal conditions, not a guarantee, particularly if surfaces are washed, vacuumed or disturbed.

Who it suits

If you want a longer-lasting residual layer on skirting boards, bed frames and crevices, this is the more conventional option. It also mentions dust mites, which can be handy if allergies are part of the picture. See the full details on Amazon before purchase.

What to keep in mind

Because this is an insecticide product, follow the label closely on ventilation, drying time, and keeping pets and children away. A residual spray also only protects surfaces it has been applied to, so thorough, careful coverage of cracks matters more than spraying large open areas.

Interceptor Traps: Your Progress Tracker

Bed Bug Interceptor Traps are not a spray, but they deserve a place in any treatment plan. The 8-pack uses a dual-ring design: you place one under each leg of the bed or sofa, and insects climbing up or down fall into the moat and cannot climb back out. They do not kill an infestation in the room, but they do two jobs well.

First, they confirm that you really have bed bugs rather than another small insect, which matters because some look-alikes, such as martin bugs, are easy to confuse with them. Second, they show whether your treatment is working. If the traps keep catching insects weeks after spraying, the problem is not solved. You can view the interceptor traps on Amazon.

Keep the bed away from the wall and make sure bedding does not touch the floor, otherwise the insects can bridge the traps.

How to Choose

Use these questions to decide:

• Is the infestation confirmed? If you are not sure, buy interceptor traps first and identify the insect before spending on sprays.
• Do you want to avoid conventional pesticides? The plant-based EcoVenger is the closer fit.
• Do you want a longer residual layer? Zero In is aimed at that, according to its listing.
• Who shares the room? Check the label for guidance on children, pets and pregnancy before you apply anything.

You can browse everything we list for this problem on our bed bug control products page.

Common Mistakes and What Doesn’t Work

Spraying only the mattress. Bed bugs mostly hide in the bed frame and nearby crevices rather than the sheets, so a mattress-only approach misses most of them.

Relying on ultrasonic devices. Plug-in repellers promise a lot, but we have not found convincing independent evidence that they clear bed bugs. Our article on whether ultrasonic pest repellers work explains why we are cautious.

Skipping the laundry step. The NHS advises washing affected bedding and clothing at 60°C and tumble drying on hot for at least 30 minutes. Items that cannot be washed can be bagged and frozen for three to four days.

Using a steam cleaner or fan heater and hoping. The BPCA warns that cold spots undermine heat treatment, and that ordinary plug-in fan heaters are not powerful enough. Full control needs insects to reach about 50°C for two hours, or 52°C for one hour, which is difficult to achieve at home.

Treating once and stopping. Bed bugs can survive for up to a year without feeding, so a quiet few weeks does not prove they are gone. Keep monitoring.

When to Call a Professional

Be honest with yourself about the scale of the problem. The NHS states that removing bed bugs yourself is very difficult and unlikely to clear them completely, and local councils recommend a professional for established infestations. Call for help if you are finding bugs in more than one room, if the traps keep filling after a couple of rounds of treatment, or if you live in shared housing where neighbours may be affected.

Look for a BPCA member, who must be trained, audited and insured, and be cautious about very cheap quotes. For heat treatments, ask for a thermolog report showing where sensors were placed and what temperatures they recorded.

Frequently Asked Questions

Sources: BPCA: heat treatments for bed bugs, NHS 111 Wales: bedbugs, Cotswold District Council: bed bug fact sheet.

This guide contains affiliate links. If you buy through them we may earn a small commission at no extra cost to you.

The most effective spider repellent for most homes is a residual spider spray applied to the places spiders get in: window frames, door thresholds, air bricks and the edges of rooms. A good residual product kills on contact and leaves a treated surface that keeps working for several weeks. Pair it with a few simple proofing steps and you will see far fewer spiders, especially during the autumn peak.

It is worth saying up front that the common house spiders you find in a bath or behind the sofa are harmless. The British Pest Control Association does not consider native species dangerous. This guide is about keeping numbers down for comfort, not about a health emergency.

Quick Picks

Recommendations are based on product labels and published guidance, not hands-on testing. Our full range is on the spider control products page.

Why Spiders Come Indoors in Autumn

If you notice more spiders from late August through October, you aren’t imagining it. BPCA explains that spiders look for dry places to breed in early autumn, and the breeding season lasts less than two months. Many of the large, fast-moving spiders you see crossing the carpet at this time of year are males searching for a mate.

Spiders also follow food. Homes with lots of flies, moths or other small insects will host more spiders. That is why dealing with a fly problem, such as cluster flies in the loft, often reduces spider numbers too.

Spider Repellent and Killer Options Compared

Residual sprays

These are the most useful products for a persistent problem. They kill spiders on contact and leave a treated surface that continues working for weeks. The 1-litre spider killer spray (view on Amazon) states up to 12 weeks of residual protection on its label, while the NOPE! 500ml spray (view on Amazon) states up to six weeks. If you have a large house, garage or several outbuildings, the NOPE! 5-litre refill (view on Amazon) is a more practical size.

• Pros: kill and deter in one product, keep working between applications.
• Cons: must be applied carefully and kept away from pets, fish tanks and food surfaces.

Contact aerosols

An aerosol like the Pestshield spider and crawling insect spray (view on Amazon) is handy for dealing with a spider you can see, or treating a corner where insects gather. It is less useful as a long-term barrier.

Proofing and housekeeping

No product works well if spiders can walk straight in. Seal gaps around pipes and cables, fit draught excluders to doors, repair torn window screens and keep vents covered with fine mesh. Regular vacuuming of corners, under furniture and behind radiators removes webs and egg sacs. Cutting back clutter in lofts, garages and under-stair cupboards takes away hiding places.

How to choose between them

Think about where the spiders are coming from and how much area you need to cover. For a flat or a single problem room, a 500ml residual spray is usually enough for a season. A detached house with a garage, conservatory and shed will get through product quickly, so a larger bottle or refill makes more sense. If spiders mostly appear one at a time and you only want to deal with them as they turn up, a contact aerosol is the simpler choice. Whatever you pick, check the label for surface suitability before treating carpets, painted wood or uPVC frames.

How to Use a Spider Spray Properly

1. Read the label first. Check which surfaces it can be used on and whether it is suitable indoors, outdoors or both.
2. Clean before treating. Vacuum webs and dust along the treatment area so the spray reaches the surface.
3. Target entry points. Spray around window frames, door thresholds, skirting boards, air bricks and where pipes enter walls.
4. Treat hiding places. Under-stair cupboards, behind wardrobes, garages and sheds are common spots.
5. Keep people and pets away until the treatment has dried, and ventilate the room.
6. Reapply on schedule. Follow the interval on the label, typically before the autumn peak and again if activity returns.

What Doesn’t Work

• Conkers. Putting horse chestnuts on windowsills is a long-standing folk remedy, but there is no good evidence it repels spiders.
• Plug-in ultrasonic devices. Regulators have challenged claims that ultrasound controls insects and spiders. We look at the evidence in do ultrasonic pest repellers work.
• Essential oils alone. Peppermint and citrus sprays smell pleasant, but evidence that they keep spiders away for any length of time is limited. They need constant reapplication and won’t fix an entry problem.
• Killing every spider you see. Spiders eat flies and other insects. If you can tolerate a few, they’re doing useful work. BPCA suggests catching individual spiders under a glass with a stiff card and releasing them outside.

A Note on False Widow Spiders

The noble false widow, a non-native species now widespread in southern England and spreading north, is often blamed for bites. Local authority guidance describes bites as rare, usually happening when a spider is trapped against skin, and typically no worse than a bee or wasp sting. Clean any bite with soap and water and use a cold compress. Seek medical help if there are signs of infection such as spreading swelling or pus, and call 999 if someone has difficulty breathing or other signs of a severe reaction. Don’t handle suspected false widows with bare hands.

When to Call a Professional

Most spider problems can be handled with proofing and a residual spray. Consider a professional if you have a very large or persistent infestation, a significant number of false widows around doors and windows where children play, or an underlying insect problem you can’t find. BPCA recommends choosing a trained pest controller who is a member of a recognised trade body.

Frequently Asked Questions

Sources: British Pest Control Association: autumn spiders; BPCA: spider control; Gravesham Borough Council: false widow spider advice.

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If your loft window is crawling with slow, dozy flies every autumn, here is the short answer: for a small number of flies, a vacuum cleaner and a few sticky fly papers will do the job. For a loft that fills up year after year, an insecticidal smoke generator labelled for flying insects is the most effective product you can buy, as long as you have checked for bats first. For a large or recurring infestation in a big or old building, a professional residual treatment is the only thing that keeps working through the winter.

Below we go through every type of cluster fly killer and trap, what each one is genuinely good at, where it falls short, and which products we would pick. Our recommendations are based on product labels and on published guidance from the British Pest Control Association and local council pest services, not on marketing claims.

Quick Picks: The Best Cluster Fly Killer for Each Job

Not sure you are dealing with cluster flies at all? Our guide to cluster flies in your loft explains how to identify them and why they keep coming back to the same house.

Insecticidal Smoke Generators

A smoke generator (often sold as a loft or garage “fumigator” or “smoke bomb”) releases a cloud of insecticide, usually permethrin, that drifts into the gaps between rafters, tiles and insulation where cluster flies hide. That is the key advantage: sprays and traps only catch the flies you can see, but most of an overwintering cluster is tucked out of sight. The BPCA notes that permethrin-based smoke formulations can be effective against cluster flies in the right situation.

Good for: enclosed lofts and roof voids with a heavy, recurring infestation.
Watch out for: fuse-lit generators carry a fire risk, you must leave the space closed for the time stated on the label, and you will need to cover smoke alarms while the product is working, then uncover them straight afterwards.

When you choose a product, look for one whose label specifically lists flying insects or cluster flies and lofts or roof voids, and check the volume it treats against the size of your loft. See our top pick on Amazon.

Sticky Fly Papers and Window Traps

Cluster flies crawl towards light on mild days, which is why they pile up on windows. Sticky traps take advantage of that habit. They contain no poison and give off no vapour, so they are the safest choice for lofts with stored belongings, spare bedrooms and anywhere bats might be present.

The limitation is scale. Council guidance describes fly papers as offering limited control that won’t cope with a large infestation, so treat them as a top-up rather than the whole answer.

Our pick: RAM 20-Pack Pesticide-Free Fly Paper

Twenty double-sided papers is enough to hang several across the loft and still have spares for spring, when the flies wake up and head for the light again. They come with drawing pins for hanging from rafters. Read our notes on the RAM fly papers or check the price on Amazon.

For flies on glass, clear window fly traps that stick to the bottom of the pane catch them as they crawl, and are much less noticeable than hanging papers in a living space. See our top pick on Amazon.

Fly Killer Sprays

A pyrethroid aerosol kills exposed flies almost instantly, which makes it handy for the cluster you find on a window in October. What it can’t do is reach the flies hibernating in cracks and behind boards, so on its own a spray won’t clear a loft.

Our picks

• Pest-Stop Wasp & Fly Killer Spray (300ml): low odour and non-staining, so it is the better choice for living areas and conservatories. Check price on Amazon.
• Sanex Fly & Wasp Killer Spray (300ml): a straightforward, fast-acting aerosol for the odd cluster on a window. Check price on Amazon.
• 6 x 300ml Fly & Wasp Killer Spray: worth it if you have a large house, outbuildings or a holiday let that gets flies every year. Check price on Amazon.

Always cover food, remove pets and fish tanks, and leave the room to ventilate as the label directs.

Electric Fly Killers and Zapper Rackets

A plug-in UV fly killer can help in a loft or top-floor room, and the BPCA suggests switching one on only during the months when flies are active. Like any loft treatment, check for bats before installing one. See our top pick on Amazon.

A battery zapper racket is the chemical-free way to deal with flies one at a time. It is satisfying, but it won’t make a dent in a loft cluster. Check the Electric Fly Zapper Racket on Amazon.

The Vacuum Cleaner Method

Don’t overlook the tool you already own. Vacuuming is simple, costs nothing and removes the flies along with the scent that attracts more to the same spot. Go up on a mild day when the flies are sluggish, work along the window frames and joists, and empty the bag or canister outside straight away. It only removes visible flies, so it suits a small problem or a quick tidy-up after a smoke treatment.

What Doesn’t Work

• Fruit fly traps: these use a fruity bait. Cluster flies aren’t looking for food when they come indoors, so they ignore them.
• Fly screens: council pest services report they are of little use, because cluster flies squeeze through tiny gaps around tiles, fascias and window frames.
• Treating the garden: the larvae develop inside earthworms in the soil, so outdoor control is neither practical nor necessary.
• Sealing every gap: filling obvious holes around frames helps a little, but complete proofing is rarely achievable.

When to Call a Professional

Call a pest control company if flies keep coming back every year despite smoke treatments, if you have bats or suspect them, if the loft is hard or unsafe to get into, or if the building is large, such as a farmhouse, church or block of flats. Professionals can use a low-pressure residual spray that keeps killing flies as they emerge for several months, or an ultra-low-volume mist that reaches high voids without scaffolding. Be aware that even professional treatment usually controls rather than eradicates cluster flies, so ask what follow-up is included.

Frequently Asked Questions

Sources: BPCA PestWatch: cluster flies and Cotswold District Council cluster fly fact sheet.