The majority of metropolitan Adelaide is under quarantine restrictions after two Mediterranean fruit fly outbreaks were declared on Tuesday.
There are 240 suburbs under the restrictions spanning from the beach in Adelaide's southwest to the eastern foothills and up to the north.
More than 100 PIRSA officers are baiting, spraying and releasing sterile insect technology across Adelaide.
Primary Industries Minister Tim Whetstone says if the plant pest becomes widespread in the fruit-producing areas of the Adelaide Hills, it would have a devastating effect on the horticulture industry.
"While South Australia has a 100 per cent success rate in eradicating fruit fly, we want to keep it that way and we need residents to do the right thing," he said.
People living in outbreak areas are being urged to remove all ripe fruit from trees, pick up any that have fallen on the ground, use what they can or dispose of rotten fruit in their green bin.
With the total number of outbreaks now reaching seven across Adelaide, the state government is looking to extend its zero tolerance policy to the Ceduna quarantine station on the Eyre Peninsula.
Mr Whetstone said there were "zero strikes and zero excuses" for people bringing in fruit and vegetables via the Yamba border crossing in the Riverland.
Those who ignore the policy are fined $375.
"This zero tolerance approach on our eastern border has successfully limited the spread of Queensland fruit fly," he said.
"But with Mediterranean fruit fly traditionally coming from the west, it may be time for us to extend zero tolerance to our Ceduna quarantine station."
Those who find maggots in their fruit should call the Fruit Fly Hotline on 1300 666 010.
© AAP 2020