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Common or German wasp

http://www.gw.govt.nz/common-or-german-wasp

Common or German wasp

Updated 12 December 2017 11:28am

German wasp
Photo: Landcare Research

Why are wasps a problem?

The New Zealand environment provides a favourable habitat for wasps because of mild winters, a lack of natural wasp predators and plentiful food supply. Consequently, New Zealand has some of the highest densities of common and German wasps in the world.

Wasps are a serious threat in homes, schools and recreational areas such as parks, forests or beaches. Wasps pose a real risk to people who are allergic to the sting. Those working in industries such as viticulture, agriculture and forestry are particularly at risk.

Wasps reduce honey bees’ productivity by raiding beehives and reducing the food supply, and they predate on native insects and honey dew, which are important food sources for many native species.

Description and background

Both common and German wasps live in large colonies, about the size of a soccer ball. The nest can become larger if the colony survives the winter. Common and German wasps have distinctive yellow and black striped bodies. The common wasp nest is yellowish to reddish brown, while the German wasp nest is grey. Both species can use their sting repeatedly.

Common wasps were first noted in the 1920s, but did not become well established in the Wellington region until 1978. German wasps have been present in New Zealand since the 1940s. Australian and Asian paper wasps are also present in the region.


What can I do?

A new and highly effective method of control is using Vespex. It’s a new protein (meat-based) bait developed in conjunction with Department of Conservation. Vespex contains the insecticide fipronil, which is deployed from a bait station. It works by wasps eating the bait and taking it back to their nests to feed the rest of the colony, wiping out the nest. It is especially useful when you have been unable to identify where wasps are nesting.

Vespex is targeted at wasps and is not attractive to bees. It is also only effective at certain times of the year when wasps are eating protein. Vespex is available from Nelson-based company Merchento, and users must pass an online test and become an approved user to ensure they use it according to the instructions.

Information on Vespex is on DOC's website

Another way to control wasps is to locate the nest and poison it directly. Food such as fruit and meat will attract wasps, and removing or covering these attractants will help discourage wasps from outdoor areas. By sitting and watching the flight line of foraging wasps it is usually possible to locate the entrance to their nest, this is easiest done in the late afternoon or evening.

Alternatively a number of powder based products can be used to poison the nest directly; these can be purchased from garden and hardware stores. Once the nest is located, all the entrances should be poisoned.

It is recommended to poison at night to lessen the chance of the wasps attacking. Fine weather is preferable, as any rain will discourage the wasps from foraging the next day and possibly effect the toxin. When the nest becomes active the next day, the wasps will carry the powder insecticide inside the nest on their legs and bodies. If the nest is still active following the poison application, repeat the procedure on the next suitable evening.

 

How can we help you?

Contact our biosecurity officers for advice on how to treat and manage wasps.

If you find a wasp nest on Greater Wellington land, let us know so that the nest so it can be dealt with immediately.

Commercial pest control companies can be contracted to control wasps.

Additional information and tips on managing wasp problems can be found at: