What we deal with
The European paper wasp, Polistes dominula, is the main problem species in Cape Town and the Boland, an invasive wasp that has spread fast through suburbs and farms in the Western Cape. It builds open, grey, comb-like nests under eaves, in window frames, inside gate posts, in letterboxes and under garden furniture, often in large numbers on a single property. South Africa also has native paper wasps such as Belonogaster species, whose nests look similar but tend to be smaller and less aggressive, and solitary mud dauber wasps that build mud cells and very rarely sting. The invasive Polistes competes with native insects and feeds on caterpillars and other invertebrates, and it also takes fruit in orchards and vineyards. Identification matters, because a single mud dauber does not need the same response as a street full of Polistes nests.
Signs to look for
Tick every sign you have noticed. It takes ten seconds.
Why it matters: Paper wasps sting when their nest is disturbed, and they can sting more than once, which is a real danger for anyone with a sting allergy and a misery for children playing outside. Nests in letterboxes, gate motors and garden furniture lead to stings because people touch them without seeing the nest. On farms and in the Winelands, Polistes damages soft fruit and grapes and gets in the way of harvest work. Because the species is invasive, every nest left alone produces new queens that start more nests nearby the following spring.
How we treat it
For ongoing wasp control we combine nest treatment with prevention rather than coming out once a year to remove whatever has grown. Active nests are treated with an insecticidal dust or spray applied directly into the comb, usually early in the morning or late in the day when the wasps are on the nest, and the comb is taken down once the colony is dead. On properties with repeat problems we do a sweep in early spring to find and remove young founding nests while they are small, and we can apply a residual treatment to favourite nesting spots such as eaves and pergolas. We also look at what is drawing wasps in, like water points, fallen fruit and open bins, and give practical advice on fixing it. For farms, estates and complexes, scheduled visits through the wasp season keep numbers under control instead of letting them build up.
- Identify the wasp
We confirm whether it is the invasive paper wasp, a native species or a mud dauber, since the response is different for each.
- Survey the property
Eaves, gutters, gate posts, letterboxes, pergolas, sheds and outbuildings are checked for active and old nests.
- Treat active nests
Each nest is treated directly with a dust or spray and removed once the wasps are dead, with old combs taken down too.
- Treat favourite sites
Where wasps keep coming back to the same spots, we apply a targeted residual treatment and recommend sealing gaps.
- Remove attractants
We point out water, fruit and food sources that keep wasps around, and suggest simple changes.
- Schedule follow-ups
An early spring check and visits through summer catch new nests while they are small, and you get a report after each visit.
Things most people don't know
Many people think wasps only nest in trees. In Cape Town the invasive paper wasp much prefers buildings, especially eaves, window frames and hollow steel poles.
The first thing a technician looks for is old nests. A row of empty combs from last year tells us the property is a favourite and needs an early spring check.
Spraying a nest in the middle of a hot afternoon is the classic mistake. Half the wasps are out foraging, they come back angry, and the nest is often rebuilt nearby.
When it peaks in Cape Town
Queens come out of hiding as the weather warms in late August and September and start small nests on their own, which is the cheapest and safest time to deal with them. Colonies grow quickly through the hot, dry summer and reach their biggest and most defensive in February and March. With the first winter rains and cold fronts the colonies die off, and only the new queens survive to start again next spring.
DIY or call a professional?
Knocking down a tiny new nest in spring is a reasonable DIY job if you are not allergic and you do it at dusk. Once a nest is bigger than your palm, or it is high up, inside a wall or near where children play, we would rather you left it to us, because most of the stings we hear about come from people tackling a big nest with a can of spray in daylight. And if wasps keep coming back every year, the problem is the property and the neighbourhood, not one nest.
What affects the price
Wasp control is priced on how many nests there are, how high and hard to reach they are, and whether you want a once-off treatment or ongoing visits through the season. A house with one or two nests at ladder height is a straightforward job, while farms, estates and complexes with nests spread over many buildings take longer. For properties that get wasps every year, a seasonal plan usually saves money compared to repeated call-outs, and the quote is free.
Preventing it coming back
- Walk around the house once a week from September and knock down any nest smaller than a coin with a long pole, at dusk, wearing long sleeves.
- Pick up fallen fruit and grapes promptly, because ripe fruit draws foraging wasps in late summer.
- Fix dripping taps and irrigation leaks, since wasps need a steady water source to build nests.
- Seal holes in hollow gate posts, steel poles and roller door channels with a cap or sealant.
- Keep outdoor bins closed and clean up after a braai, as wasps scavenge meat and sweet drinks.
- Check garden furniture, umbrellas and the inside of letterboxes before using them in summer.
Frequently asked questions
Why do wasps keep coming back to my house every year?
Paper wasps like the same sheltered spots, and new queens often start nests close to where they were born. Removing nests early in spring and making those spots less attractive breaks the cycle.
Is the European paper wasp really invasive?
Yes. Polistes dominula is not native to South Africa and has spread widely through the Western Cape, where it competes with local insects. That is why we treat it rather than leave it.
Should I kill native wasps too?
Not necessarily. Mud daubers and many native wasps are harmless and useful in the garden, so if a nest is out of the way and not a stinging risk, we may suggest leaving it.
When is the best time to treat wasps?
Early spring, when nests are small and only the queen is there. Later in summer the same nest can hold dozens of wasps and is far more likely to cause stings.
Do wasp traps work?
They catch some foraging wasps, but they rarely reduce the number of nests and can attract more wasps to your garden. Finding and treating the nests works much better.
Can you look after a whole estate or farm?
Yes. We do scheduled wasp checks for estates, complexes and farms through the season, with a report after each visit.
How quickly can you remove a wasp nest?
Our average turnaround is around 48 hours, depending on the season. If a nest is right by a door or someone is allergic, tell us, and we can arrange an after-hours or weekend visit on request.
Is it safe to spray a nest myself?
It is risky with a large nest, because a can of spray rarely kills the whole colony and the survivors get very defensive. Small nests at dusk are another story.
What if the nest is inside a wall?
We treat it through the entrance hole with a dust, wait for activity to stop and only then seal the hole, so the wasps are not forced inside the house.
Wasp Control by area
We cover all of these suburbs from our base in Brackenfell. Pick yours for local advice.
