South Australia will try and protect its apple and pear orchards from fire blight with new quarantine areas.
The federal government has cleared the way for New Zealand to export apples to Australia, lifting a ban introduced in 1919 for fear of fire blight disease.
SA's Agriculture Minister Michael O'Brien says Australian quarantine officers have already found in two consignments an apple with leaf matter that could have been carrying fire blight and an insect pest.
"Within three days the assurances we have been given, as a nation, have proved to be very, very flimsy," the minister told reporters on Tuesday.
Three quarantine zones will be set up - new ones in the Adelaide Hills, where 80 per cent of the state's apples and pears are grown and one just outside Mt Gambier.