Pest wasps are costing New Zealand's economy $130 million a year.

Pest wasps are costing New Zealand's economy $130 million a year, a new study says.

The impact of the introduced pests included wasp-related traffic incidents, costing $1.4 million a year, and more than $1 million in health costs from wasp stings.

But the greatest impact was on farming, beekeeping, horticulture and forestry, the study said.

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