Wasps: Why They Buzz Into Your Backyard (And What to Do)

By BridgetUncategorized

Hey — Bridget here (Office Manager and Craig’s better half). Wasps are one of those pests people tend to fear (and for good reason). Let me walk you through what to watch for and how we handle them.

The wasp life cycle in NZ

In the cooler months, most wasp workers die off, leaving just the queen to hunker down and survive the winter. As spring warms up, the queen emerges, builds a nest, and starts laying eggs. In summer, the nest grows big, and the wasp activity is intense — especially toward late summer when food is scarcer. By autumn, nests are large and the threat of stings increases.

Because worker wasps die with frost, you’ll see few in winter — but that doesn’t mean everything is safe. Queens may hide in roof cavities, wood piles, or under eaves.

Signs you have a nest (and where to look)

  • Wasps hovering around eaves, guttering, roofline, or under decking
  • A steady line of wasps entering and exiting a hole (nest entrance)
  • Buzzing behind wall cavities, inside sheds or roof spaces
  • In summer afternoons, more wasps around food, fruit trees, or rubbish bins

If you spot a nest: don’t disturb it. Move away slowly and call us right away.

How we deal with nests

At Combined Pest Control, our standard approach is:

  • We apply a powder or insecticidal formulation to the nest entrance. Wasps carry the powder into the nest and it spreads internally.
  • Usually one treatment will do the job (most nests collapse in 4–5 days).
  • Occasionally a large or complex nest might require a follow-up treatment.
  • After treatment, wasp activity around the nest will spike briefly (for ~30 minutes), so it’s critical to keep doors/windows closed near the nest.

We always take care to approach this safely, especially around people, pets, or children.

Preventing wasp issues

  • Inspect your property in spring for early nest building (eaves, under decking, tree hollows).
  • Trim trees or bushes close to the house — less shady cover for nests.
  • Seal gaps and cavities around rooflines or fascia.
  • Avoid leaving food or sugary drinks exposed outdoors — they attract wasps.
  • Maintain clean rubbish bins with tight lids.

If you ever spot wasps behaving unusually or believe there’s a nest nearby, give us a call before it becomes a sting hazard.

Warm regards,
Bridget