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Home / The Country

Wasp nest numbers soar in Raetihi

By Lin Ferguson
Whanganui Chronicle·
17 May, 2017 02:22 AM2 mins to read

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Wasps' nests can grow very large over time.

Wasps' nests can grow very large over time.

Wasps throughout the Ruapehu District have become a huge problem, especially in Raetihi.

A member of the volunteer wasp extermination team, Mike Maru, said the district has been plagued by wasps during the wasp nest season from December to April-May.

In that period DoC's five-person extermination team killed off 270 nests in Raetihi alone, he said.

A German wasp. Volunteer wasp exterminators have been to 270 nests this season.
A German wasp. Volunteer wasp exterminators have been to 270 nests this season.

That is double the usual number.

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Even though it was an "oddball" summer, he said the wasp population had grown dramatically again.

"We had a strange summer because it was never really warm."

Funding for the volunteer crew set up by DoC is provided by Ruapehu District Council and Horizons Regional Council.

A member of a community work team with a Corrections Department crew had to be pulled off the job in March after a worker was stung.

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The crew were pulled off the work site and Raetihi Promotions was asked to remove the wasp nest before the team would return to the site.

Wasps especially like sweet foods, and compete with birds for nectar, fruit and honeydew.
Their nests are started by a queen wasp, usually underground, and their numbers increase as the summer goes on. Winter usually kills the whole nest, leaving the queen to take shelter and start a new colony the following spring.

Nests are grey and made by the wasps out of chewed-up wood fibre, softened with saliva. The larvae inside are kept at a constant temperature by the insulating paper-like material and by the movement of adult wasps, called "shivering".

Wasps can become aggressive if their nest is threatened and adult wasps stings can be dangerous.

Mr Maru said when approaching a wasp nest the guard wasps stream out in single file ready to attack.

"Sometimes if you're looking into the sun at the end of the day you can often see a V shape of wasps like little Kamikaze pilots heading home to their nest.

"It's an incredible sight."

The powder insecticide Permethrin is given to the group to exterminate the wasp nests, he said.

However, the group's labour is completely voluntary, although most people who call them make a donation.

"Donations are good because we're using our own petrol to get there.

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"But mostly people are really good and appreciate us coming in ."

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