When are mosquitoes worst in Darwin?

NT Health's 2021 calendar puts the high season from October to mid January, with numbers low from February to July. Heavy rain from October to December can also bring big numbers outside the usual peaks.

Do biting midges carry disease?

NT Health's 2017 calendar says biting midges don't transmit disease to people in Australia. Scratching the bites can lead to a bacterial infection, so leave them alone and keep them clean.

Can Which Pest help in Palmerston too?

Yes. Tell us what you've seen and your postcode, and we look for a local business near you that does that job. Our Palmerston page has the local detail.

Pest control Darwin: termites, mosquitoes and midges

What's different in the Top End

The giant northern termite

CSIRO calls the giant northern termite, Mastotermes darwiniensis, a particularly voracious species above the Tropic of Capricorn. The Australian Museum says it has the greatest potential for destruction, and it's limited to tropical northern Australia.

Salt marsh mosquitoes come in waves

NT Health's 2021 calendar says Darwin can usually expect very high salt marsh mosquito numbers between October and mid January, with few from February to July. Numbers jump after each spring tide and after heavy rain.

Midges near the mangroves

The mangrove biting midge is worst within about 2 km of mangroves, with peak numbers from August to November, NT Health's 2017 calendar says. They bite most in the 2 hours either side of sunrise and sunset, and around the full moon.

A dated health fact, not a pest job

Salt marsh mosquitoes can carry Ross River and Barmah Forest viruses, and NT Health's 2021 calendar names December and January as the highest risk months in the Top End. That's a matter for NT Health and your doctor; no pest treatment prevents it.

Why a yard spray can't fix the mosquito season

NT Health says salt marsh mosquitoes can fly up to 50 km, though they're most common within 5 km of where they breed: mangroves, brackish swamps and tidal flood plains. So the swarm at your back door often hatched a long way from your yard.

What changes your evenings is screens without holes, nets over beds, long loose sleeves and a repellent with DEET, picaridin or oil of lemon eucalyptus, as healthdirect suggests. A pest business can treat resting spots around the garden, but ask what it will and won't change before you agree. For the mosquito forecast itself, NT Health's 2021 calendar lists Medical Entomology in Darwin as the contact.

The NT rules, in plain terms

Household pest control in the NT needs a pest management technician licence under the Medicines, Poisons and Therapeutic Goods Act 2012. The Department of Health's Medicines and Poisons Control runs it, a licence lasts up to 3 years, and it names the pesticides the holder may use.

The same Act says any advertisement for pest control offered by a business must show a pest authorisation number, and that includes a social media post or a flyer on a noticeboard. If a letterbox flyer or a post offers pest work with no number on it, ask why before you say yes.

Other things Darwin homes find

Big brown cockroaches under the house are often the Australian cockroach, which Victoria's health department says is most common in warm subtropical to tropical places. It usually lives outside around shrubs and trees and wanders into the subfloor, walls and roof.

Green-head ants turn up in yards right across Australia and can sting; healthdirect says green ant stings may cause an allergic reaction. Birds nesting under the roof or a solar panel are a proofing job, covered on our bird proofing page.

Questions to ask any Darwin pest business

What's your NT pest authorisation number, and which pesticides does the licence cover?
Will the termite inspection include the roof space, the subfloor and the garden, with a written report?
Which product will you use, by its full name, and how long before kids and pets go back in?
What follow-up visit is included, and what does any warranty cover, in writing?

What we'd do about pests in Darwin

On a Darwin house we'd put a termite inspection first, because the giant northern termite is the one that does real damage. For mosquitoes and midges, screens, sleeves and planning evenings around the tides do the heavy lifting.

Want someone to look at it?

Tell us what you've seen and your postcode, and a local pest business that handles exactly that calls you to talk it through.

What have you seen?

Pest control in Darwin

Pest control in Darwin: what to know before anyone calls