About 170ha of grape vines in the Nelson region will have to be replanted at a cost of up to $2.24 million after the discovery of phylloxera aphid.
Growers have been urged to use grafted plants.
The pest attacks vines by chewing on roots and reducing plant vigour and production.
Phylloxera devastated Marlborough grapes in the 1980s.
Pest hits Nelson vineyards
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