Ant control in Auckland

Ant control in Auckland mostly means dealing with two invaders: the Argentine ant, which arrived in 1990 and now forms huge colonies across the region, and the white-footed house ant, which nests in walls and ceilings. Both have many queens and many nests, so killing the ants you see doesn't fix the problem. What works is reaching the nest, usually with the right bait used properly, and calling a specialist when the colony is in the house or keeps coming back. Below you'll find how to tell which ant you have, what you can do yourself, what a professional treatment costs, and how to get quotes from local specialists across Auckland, from the North Shore to South Auckland.

Which ants cause problems in Auckland homes?

The ants behind most Auckland problems are the Argentine ant and the white-footed house ant. Consumer NZ names them as New Zealand's two main house invaders. Darwin's ant, also common in Auckland gardens, sometimes comes inside in large numbers for sugar. New Zealand has 38 known ant species, 27 of them introduced.

Argentine ants first turned up at Mt Smart Stadium in 1990 and spread across the region from there. Darwin's ant was first recorded nesting in New Zealand at Penrose in 1959. Our page on Argentine ants in Auckland covers the region's most damaging ant in detail.

What are the signs of an ant infestation?

The signs of an ant infestation are steady trails of ants along the same route every day, ants in food cupboards or sealed jars, ants coming out of walls, skirting boards or power points, winged ants indoors, and small piles of soil at the edges of paths and paving. One or two scouts aren't an infestation. A daily trail is.

Other signs to watch for:

• ants climbing trees and shrubs where aphids and scale insects are thick on the stems,
• ants swarming over the pet food bowl,
• ants appearing in the bathroom or laundry, looking for water,
• trails that come back within a day of being wiped away.

Where the trail goes tells you where to treat. Follow it back to its entry points: gaps around pipes, window frames and weatherboards.

Can I do ant control myself?

Yes, for a small or new problem. Find the trail, keep food and water away, and put bait beside it so the workers carry it back to the nest. Match the bait to the ant: sugar baits for most species, protein fipronil baits for Argentine ants. Leave it for one to two weeks. Call a specialist when the colony is in the walls or baiting fails.

Our guide on how to get rid of ants walks through the method step by step. If they're already inside, start with how to get rid of ants in the house. For products and home-made recipes, see the ant bait guide.

The basics that help every time:

• Food: store sugar, honey, cereal and pet food in sealed containers.
• Water: fix drips and wipe sinks at night.
• Pets: lift wet pet food after meals. Consumer NZ notes Argentine ants are drawn to it.
• Patience: don't spray the trail while the bait is working.

Will ants leave if you keep killing them?

No. Killing the ants you can see doesn't make a colony leave, because the queens and brood stay in the nest and keep producing workers. For Argentine and white-footed ants, with many queens across many linked nests, spraying trails can even make things worse by splitting the colony. The colony only goes when the bait reaches the queens.

The life cycle explains why. Ant colonies have queens, males and workers. The workers you see are wingless females that gather food. The queens lay the eggs, and the larvae are fed by the workers. Landcare notes that Argentine ant queens don't lay eggs when the daily mean temperature is below about 18.3°C, which is why numbers drop in winter and boom from spring.

Is killing ants a bad idea?

Killing ants in the garden is often unnecessary, because most ants do little harm outdoors. Killing Argentine ants is a good idea: they're one of the world's worst invasive species, they harm native birds and lizards, and Auckland's regional pest plan lists them for sustained control. Inside the house, controlling any ant colony is sensible for hygiene and to protect the building.

What to avoid is killing ants the wrong way. Spraying and squashing trails kills foragers but leaves the nest, and can stop baits working. Harsh chemicals near waterways can harm aquatic life. Target the colony, not the trail. Our page on the best ant control compares the options.

When should you call an ant control specialist?

Call a specialist when ants are nesting inside your walls, ceilings or subfloor, when a few weeks of proper baiting hasn't reduced the trails, when you have white-footed house ants, or when Argentine ants cover your whole section. A specialist identifies the species and uses products that aren't sold to the public.

Our page on ants in the house explains what a treatment involves. For published Auckland prices, see ant control cost. When you ask for quotes, tell us your suburb, whether that's on the North Shore, in West, East or South Auckland, or the central suburbs.

Which ants need to be reported?

Fire ants must be reported. The red imported fire ant, the tropical fire ant and the little fire ant are all notifiable under New Zealand law, according to the Ministry for Primary Industries' Official New Zealand Pest Register. If you think you've seen one, call the MPI exotic pest hotline on 0800 80 99 66. Argentine ants don't need to be reported.

The red imported fire ant has been found and eradicated in New Zealand three times. Te Ara describes its sting as being as painful as a bee sting, leaving a small pustule. Don't disturb a suspected nest.

Questions people ask

How much does ant control cost in Auckland?

Published Auckland prices for a single ant treatment on a standard home range from about $210 to around $370 including GST, depending on the house size and whether inside, outside or both are treated. White-footed and Argentine ants may need a programme of visits. See our ant control cost page for the details.

Can ants damage my house?

Ants that nest in wall cavities, ceilings and subfloors can get into electrical areas, and Landcare notes Argentine ants get into walls, cupboards and electrical fittings. The coastal brown ant, found in some coastal Auckland suburbs, is known overseas to chew irrigation pipe and cabling. Most damage comes from large colonies left untreated.

Why are there so many ants in Auckland?

Auckland's mild, warm climate suits introduced ants, most of which came by accident from Australia. Te Ara notes that most introduced ants are found in the warmer parts of the North Island. Argentine ants were first found in Auckland and spread around the region by budding and in pot plants and soil.

Is pest control good for ants?

Yes, when it targets the nest. A professional treatment that identifies the species and uses baits or non-repellent products can control colonies that DIY methods miss, especially white-footed ants in walls. A quick spray of the trails alone rarely lasts. Ask any specialist how they plan to reach the queens.

Do ants come back every year in Auckland?

Often, yes. Ants are most active in the warmer months, and Argentine ant nests grow in spring and summer. Colonies on neighbouring properties can move back in after your treatment. Spring baiting, sealed food and fixed drips make your house much less likely to be reinvaded each year.