The tax, set to come into effect in July, will see people on working holiday visas taxed at 32.5 per cent from the first dollar they earn.
Northern Territory Chief Minister Adam Giles said he would raise growers' on-going concerns about the tax at the next meeting of the Council of Australian Governments meeting.
Katherine farmer Peter Marks hired Pacific Islanders to pick mangoes last year, with backpackers in the packing shed, but was “in a state of concern” about whether he would be able to find enough workers for the upcoming harvest.