How to Prevent Wasps

Summer in Ireland is meant for outdoor living, but few things spoil a family barbecue or a quiet coffee on the patio faster than buzzing, aggressive wasps.

While a single wasp passing through your garden isn't a major issue, seeing them constantly usually means a queen has set up home nearby. The real secret to avoiding a painful sting later in the season isn't chasing wasps around with a fly swatter—it is taking a few smart, preventative steps in early spring to stop them from building a nest in the first place.

At Rentokil, we believe prevention is always safer and easier than dealing with a fully grown nest. Here is our practical, human guide on how to keep wasps away from your home and business.

Wasps are simple creatures. They choose nesting spots based on two main things: reliable food sources and safe, dry shelter. If you take those two things away, they will happily move somewhere else.

During early summer, worker wasps hunt for protein to feed their growing grubs. By late summer, their dietary needs switch entirely to sugar, which is usually when they become most aggressive around humans.

• Keep bins tightly closed: Outdoor rubbish bins are like an all-you-can-eat buffet for wasps. Make sure your wheelie bins have secure lids and sit well away from your back door or outdoor seating areas.
• Cover food and drinks outside: Never leave sweet drinks, open cans of pop, or picnic food exposed. A wasp can easily crawl inside an open drink can unnoticed, creating a severe sting hazard.
• Clear up fallen garden fruit: If you have apple, plum, or pear trees in your garden, pick up fallen fruit promptly. Fermenting, sugary fruit on the ground will attract dozens of wasps from across the neighbourhood.
• Feed pets indoors: Try not to leave pet food bowls outside, especially wet meat, as worker wasps will gladly harvest it for protein.

In early spring (around April and May), queen wasps wake up from hibernation and begin scouting for nest locations. At this stage, a new nest is no bigger than a golf ball or a small walnut.

Check the usual hideouts: Take a quick walk around your property every few weeks in spring. Look under shed eaves, inside garden structures, around loft hatches, and beneath porch roofs.

Catch them early: If you catch a queen wasp building a tiny golf-ball-sized nest early on, it is much easier and safer to deal with before it grows into a mature colony containing thousands of wasps by August.

Even if wasps nest nearby, you can easily stop them from getting inside your actual living spaces by taking a few basic home proofing steps.

Many homeowners prefer trying natural methods before calling in professionals. While natural deterrents won't destroy an existing nest, they can help make specific seating areas less appealing to foraging wasps.

• Peppermint Oil: Wasps dislike the strong smell of peppermint. Mixing a few drops of peppermint essential oil with water and spraying it around patio furniture, window frames, and porch roofs can help keep them at bay.
• Eucalyptus & Lemongrass: Planting herbs like mint, basil, or lemongrass around outdoor dining tables acts as a natural deterrent while keeping your garden looking great.
• Decorative Fake Nests: Wasps are fiercely territorial and generally won't build a nest within 10 metres of another colony. Hanging a fake decoy nest near your patio in early spring can sometimes convince a queen to look elsewhere.