The Ministry for Primary Industries (MPI) is further tightening restrictions around the movement of fruit and vegetables in the Auckland suburb of Northcote after a third Queensland fruit fly was found.
The fly was caught in a trap just outside the previous Zone A controlled area, and was 270m away from where the second fly was trapped.
MPI says the find is a good sign, and "showing the effectiveness of our surveillance programme."
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"Importantly, we still have no evidence of an established breeding programme."
There are 5243 fruit fly traps in Auckland, which have all been checked, including over 600 in controlled areas that are being checked every day or every third day.
MPI says Biosecurity New Zealand has disposed of over five tonne of waste since February 28 in communities within the controlled zones.
A new map of the extended control area can be found at biosecurity.govt.nz/fruitfly.