It means she can't even move whole fruit and vegetables out of that 200m radius into Zone B, the 1.5km circular controlled area.
Ms Teirney grows a variety of fruit in her garden, including nectarines, lemons and grapes, which she often puts in her two sons' lunchboxes.
Her youngest boy is 4-year-old Layton Anderson, who goes to Parihaka Kindergarten, which is also in Zone A.
Her eldest, however, 7-year-old Malakai Anderson, goes to Whangarei Primary, which is out of both Zones A and B.
This means he cannot take fresh fruit from home to school in his lunchbox. Ms Teirney has had to instead pack dried fruit.
"I ideally would like him to take fresh fruit to school. He doesn't really like dried fruit," she said.
Residents in Zone A are also asked to dispose of all fruit and vegetable waste in the special bins placed outside each house.
"You're rushing doing dinner and it's very easy to forget to separate your vege peelings," Ms Teirney said.
She said around four traps had been set up in her garden.
AsureQuality surveillance manager Kerry King said they were called Linfield traps. It is a plastic trap with four holes that include pheromones to attract the male flies.
"In the bottom of the trap we have a DDBP insecticide strip, which if the fly happens to fly into the trap, instantly knocks the fly down and kills it.
"So we can come along and inspect the trap, and any samples we find are brought to the MPI entomologist for inspection," she said.
Arna-Lise Harris said on the Northern Advocate Facebook page that she was now in Zone B, after being Zone A in January. "This time I have to take my food scraps and garden trimmings down the street every day," she said.
"Better to be safe and rid of that pest than to have our horticulture industry in absolute strife."
In January, Countdown Okara fell into the parameters of Zone B, which meant people could not purchase fruit there and travel out of the zone.
This time there are no restrictions around purchases from Countdown, nor are there any on Pak'n Save or Turners and Growers.