Mosquito guide
How to Get Rid of Mosquitoes in Your Backyard
A backyard audit you can run yourself: every place water hides, what to tip, cover, screen or leave alone, and an honest account of what is still possible when the source is over the fence.
Half an hour with a bucket beats an afternoon with a spray can. Every time.
How can we get rid of mosquitoes is a question with a dull answer that happens to be correct: find the water. An adult mosquito is the end of a process that began in something holding water nearby, rarely more than a short flight from the chair you are sitting in, and more often than not on your own block. Kill the adult and the water keeps producing. Remove the water and there is nothing left to kill.
This guide is a property walk you can do yourself on a Saturday morning, in roughly the order a technician would do it. It lists the containers people forget, the parts of a roof nobody looks at, the difference between water that needs tipping and water that needs screening, and the handful of spots where adults sit out the daylight hours. It sits in the same set as Tim's other guides to the pests he treats.
It also sets expectations honestly. A thorough audit transforms most suburban blocks. It does not do much at all if the real source is a neglected pool two doors down or a drainage reserve behind the fence, and the last section deals with that case rather than pretending it away.
The audit
How can we get rid of mosquitoes when they breed in water we never see?
In anything that has stood still through roughly a warm week, and the vessel holding it is nearly always smaller than people picture. Victorian health advice is blunt about this: mosquitoes breed in even the tiniest amounts of water. A bottle cap will not do it, but a pot saucer, a sagging pool cover or a plugged downpipe absolutely will.
Work around the block in a loop rather than wandering, and write a list as you go. The point is not to remember everything; it is to find the two or three sources that are doing the real work, because a yard rarely has a dozen active ones.
Saucers, bases and low spots
Plant saucers are the first thing to go. So are the hollow bases of big planters, the dish under an outdoor pot stand, buckets, upright watering cans, pet bowls nobody empties, sandpit lids, the tray beneath an outdoor fridge and a recycling bin whose lid will not close.
Then the ground itself. Low spots in paving, a sunken garden bed, a puddle that never quite dries beside the tap, and the trench left by last year's trenching job.
Gutters, pits and tanks
A leaf plug or a slight sag in a gutter can hold water for weeks, and none of it is visible from the lawn. Add box gutters, a choked downpipe, a silted stormwater grate, the sump in a carport and an agricultural pit under a side path.
Tanks are the big one. Every opening needs intact mesh, and one perished inlet screen turns the largest container on the property into the largest nursery.
Covers, trailers and toys
Anything with a tarp or a cover over it collects a pool in the sag: trailers, boats, the barbecue, the woodheap, a stack of chairs. Wheelbarrows left face up, kids' toys, upturned lids, old tyres and a spare pot behind the shed all qualify.
None of this needs a product. It needs tipping out and turning over, then repeating weekly while the weather is warm.
Timing gives the audit its urgency. The Victorian Department of Health treats November as the start of the mosquito season across the state and runs trapping and virus testing through the warmer months. A walk of the block in early spring, before the first warm wet spell, is worth several in January once the generations are already running.
Two Melbourne-specific notes. Blocks near the bay, the lower Yarra or the wetland reserves around Carrum and Edithvale get arrivals from water that belongs to nobody, which changes what is achievable on your own side of the fence. And Victorian guidance names Buruli ulcer as a concern in parts of bayside Melbourne, with mosquitoes among the suspected contributors, so bite avoidance in those suburbs is worth taking seriously rather than shrugging off.
Honest ratings
Which backyard mosquito products are worth buying?
Skin repellent and a decent fan are the two that reliably work. Almost everything else sold for a backyard is weak, situational or useless. Victorian health advice points to picaridin or DEET on exposed skin, and the physics of a fan does the rest: mosquitoes are poor fliers and a moving column of air defeats them.
| Product | What it does | Worth it? |
|---|---|---|
| Skin repellent with picaridin or DEET | Protects the person wearing it, for hours | Yes, and it is the single best buy |
| A pedestal or ceiling fan | Moving air stops them landing and scatters your scent | Yes, cheap and genuinely effective |
| Coils and citronella candles | Weak plume in still air, close range only | Marginal, and worthless in any breeze |
| Plug-in vaporisers | Works in an enclosed space such as a sheltered verandah | Situational, switch it off when nobody is there |
| Electric zappers | Kills insects attracted to light | No, it mostly kills moths and beetles |
| Ultrasonic repellers | Emits a tone and nothing else | No, and no testing supports the claims |
The fan deserves more credit than it gets. Mosquitoes fly slowly and they track a plume of carbon dioxide and body odour drifting downwind of you. A fan on a low setting disperses that plume and makes landing difficult, which is why an outdoor table under a ceiling fan is noticeably more comfortable than one two metres away from it. It costs less to run than any repellent costs to replace.
Zappers are worth a hard word because people buy them expecting the most and get the least. Mosquitoes find you by breath, warmth and smell rather than by light, so a light trap collects the harmless night insects of your garden instead. Hanging one near where people sit also puts a light source exactly where you did not want one.
Read the active ingredient, not the front of the bottle. The words natural, tropical strength or family safe tell you nothing about how long a repellent lasts. The active and its concentration do, and a sweated-off application after two hours in Melbourne humidity protects nobody. The detail is in Tim's rundown of which mosquito repellents hold up.
The house
How do you keep mosquitoes out of the house itself?
Intact screens of the right mesh, closed gaps, and an awareness of the two openings nobody thinks about. Victorian guidance sets screen mesh no coarser than 12 by 12 per 25 mm, which is about 1.2 mm, so a stretched, torn or oversized screen is a doorway rather than a barrier.
Start with the screens, because they are the cheapest permanent fix available. Check each one by eye against the light. Look at the corners where the spline lifts, the strip along the bottom of a sliding door where a pet has pushed through, and the frames that have gone brittle and sagged away from the surround. A mesh you can poke a pen through is not doing the job.
- Weep holes and vents. The small brick openings low on the wall, subfloor vents and wall vents all lead inside. Fine mesh covers them without blocking the airflow they exist for.
- Evaporative cooling. A rooftop evaporative unit pulls outside air straight through the house, and the ducts and the roof unit itself are a direct path in. Mention it to whoever services the unit.
- Door gaps. The strip of light under a back door is enough. A brush seal costs very little and keeps out far more than mosquitoes.
- Chimneys and flues. Open and unscreened, they are a highway. Mesh at the top solves it, along with a few other problems.
Timing your evening around them helps more than people expect. Most of the biting in a Melbourne backyard happens in the hour either side of sunset and again around dawn. Eating earlier, moving the table away from dense planting, and closing the house up before dusk rather than after it removes a large share of the problem without buying anything.
Clothing is the other free control. Loose, light-coloured, long-sleeved cotton defeats a mosquito that would otherwise reach skin, and loose matters because they will bite straight through fabric stretched tight over a shoulder or a knee.
Renting with torn screens? Flyscreens are part of the condition of the property, so a torn or missing screen is a reasonable repair request to put to a rental provider. Ask in writing and keep the date, because written requests are what count later. Consumer Affairs Victoria sets out the process for repairs in a Victorian rental.
Two strategies
What is the difference between area control and personal protection?
Personal protection stops you being bitten. Area control reduces the number of mosquitoes in a defined space. They solve different problems and most households need both. A repellent on your arms does nothing for the children on the trampoline, and a treated yard does nothing for you at a mate's barbecue two streets away.
Travels with you, works immediately, costs little, and stops the moment you forget to reapply it.
The only thing that reduces the total population. Free, permanent while you keep it up, and limited to your own boundary.
A residual applied to the shaded foliage and structure adults sit on through the day. Lasts weeks, not a season.
Protects nobody and reduces nothing. The money belongs in the first three rows.
Area control is where the idea of resting places matters, because it is the part most people have never heard of. Adults do not fly all day. They spend the daylight hours sheltering somewhere cool, humid and out of the wind: the underside of dense leaves, the inside of a hedge, ivy on a fence, the shaded face of a brick wall, under decking, inside a carport. A residual product on those surfaces reaches them where they rest instead of trying to hit them in flight.
Victorian health advice supports exactly that approach for properties under real pressure, alongside knockdown sprays for the ones you can see indoors and plug-in vaporisers for enclosed outdoor areas. It also warns against spraying near fish ponds, which is worth remembering before anyone starts.
Tipping out a bucket removes a hundred mosquitoes that have not hatched yet. A spray can kills the three you can see.
Keeping the resting places small is free as well. Trim the lawn, thin the dense shrubs near where people sit, lift the skirt of a hedge off the ground, and cut back whatever is pressing against the walls of the house. The Victorian home checklist makes the same point about keeping gardens trimmed to reduce the places adults shelter.
The limit
When is a mosquito problem past what you can do yourself?
When the water audit is genuinely done, the screens are sound and the yard is still unusable at dusk. That pattern points at either a source you cannot reach or so much shaded planting on the block that the adults have a permanent hotel. Both are addressable; neither is addressable with a supermarket spray.
- Every container tipped and the biting has not changed after a fortnight.
- A dense, heavily planted garden with deep shade where people sit.
- A date that cannot move, such as a wedding, a birthday or a long lunch.
- A neighbouring property with a green pool, an unscreened tank or stacked water-filled pots.
- A reserve, wetland or drainage easement directly over the back fence.
Be clear about what a treatment is and is not. It is a residual placed on the surfaces adults rest on, inside a defined zone, that keeps working for a number of weeks and less after heavy rain or a hard prune. It is not a fog, not a force field and not a season-long guarantee, and anyone who sells it as one is overselling. Paired with the water work, it usually turns an unusable patio into a comfortable one, which is the honest promise.
Two sources sit outside anybody's control. A neglected pool or an unmaintained property next door is a conversation first and a council matter second, since local councils run mosquito programs and are the right contact for a public breeding site. Blocks backing onto wetland get arrivals no treatment on your side can prevent, and the sensible aim there is a usable entertaining area rather than an empty suburb.
Tim covers Melbourne and the surrounding suburbs to about 40 km out, working on his own, fully insured, under Victorian licence No. 86488. Covered work carries his three month re-treatment guarantee, which applies inside the zone he treated. What a visit covers, and how it is timed around an event, is on the page for mosquito treatment in Melbourne. The weekly routine that keeps your half under control is in the guide to stopping mosquitoes breeding around a garden, and the bite side is covered under relief and prevention for mosquito bites.
For a figure, Tim needs the size of the area, how much dense planting there is, what water is on the block and whether there is a date involved. The booking and quote form takes all of that, and a scope with one price comes back before anything is held.
Questions
Backyard mosquito questions
Do citronella candles work?
Barely, and only within about a metre in completely still air. The plume disperses the moment there is any breeze, and it protects nothing once the candle is out. They set a nice mood and they are not a control measure, so do not let one replace repellent on skin.
What is the best repellent to use?
Pick one whose active ingredient is picaridin or DEET, put it on every piece of exposed skin, and reapply as often as the label tells you.
Victorian health advice names those two. Concentration drives how long it lasts rather than how well it works, and sweat and swimming shorten it considerably.
How do I stop them breeding in the first place?
Tip out, turn over or screen anything that holds water, and repeat it weekly through the warm months. Pet bowls, bird baths and vases get fresh water at least weekly, gutters and drains get cleared, tanks get intact mesh on every opening, and pools stay chlorinated or properly covered.
Can mosquitoes breed in a swimming pool?
A neglected one, yes. Larvae take their air at the surface rather than from the water, so depth and clarity do not protect a pool that has stopped being maintained. A chlorinated, filtered pool is not a problem. The water sitting in the sag of the cover on top of it often is.
Are mosquitoes in Melbourne a health risk?
In most households they are an itch and an annoyance, and the useful response is fewer bites rather than more worrying. The state does trap and test mosquitoes for a list of viruses right through the season, and bayside areas have Buruli ulcer advice attached to them. Health questions belong with a doctor or a nurse line.
How long after clearing the water before it improves?
Give it a fortnight. Adults already flying have to live out their lives, and a generation already developing in water you missed will still emerge. A steady improvement across two weeks means the audit worked; no change at all means there is a source you have not found.
Done the water audit and the deck is still unusable?
Describe where you get bitten, what time it starts and what sits over your back fence, and Tim will tell you what a treatment can realistically do.
Reviewed October 2026 by Tim, licensed pest control operator (Victorian licence No. 86488). Home checklist, screen mesh and repellent actives: Better Health Channel. Season timing and virus surveillance: Victorian Department of Health. Renting and repairs: Consumer Affairs Victoria.