Two more of the male Queensland fruit fly have been found in the Auckland suburb of Northcote, bringing the total to six.
Biosecurity New Zealand (BNZ) says the discovery means it is "zeroing in" on the flies and will increase its operational response.
The latest finds will mean an expansion of Zone A in Northcote and restrictions on the movement of fruit, vegetables and green waste, head of Biosecurity New Zealand Roger Smith said.
Zone A now extended south to the bottom of the Northcote Pt.
Detailed maps and information from the Ministry for Primary Industries can be found here.