The PSA kiwifruit vine disease may have spread to the Gisborne region.
Kiwifruit Vine Health says leaf samples taken from a block near Te Karaka in Poverty Bay have provisionally tested positive for PSA-V.
The orchard is about 70km from the closest infected block, in the Opotiki area of the Bay of Plenty.
If a further test confirms the provisional result, it means PSA-V will have spread to all the main kiwifruit growing areas in the North Island.
KVH has established a provisional control area near Te Karaka, which will affect 10 kiwifruit growers.
They have been asked to closely monitor their blocks, start spraying, put strict hygiene procedures into place and not allow any kiwifruit plant material to be taken off their orchards.
KVH will hold a meeting with Poverty Bay growers in the next few days.