"That affects exports worth over $400 million a year and the implications for this spreading to other goods are hugely serious."
Mr Key must tell his Australian counterpart to end these actions, Mr Goff said.
"A soft approach by John Key isn't good enough. It is hypocrisy for the Australian Government to preach a single economic market and allow this situation to continue. It fundamentally undermines CER."
Mr Key departed for Australia today, along with a sizeable New Zealand delegation.
"The joint meeting of cabinet ministers is a good opportunity to set the agenda for the trans-Tasman relationship and allows ministers to engage directly with their counterparts on a range of issues and identify areas where we can build on our close relationship," Mr Key said in a statement.
"Their participation recognises the important role two-way trade and investment plays in the relationship between our countries and the integrated nature of our economies under the CER agreement."
The prime ministers are also expected to discuss possible measures to address concerns the Australian Government is too harsh in denying social funding to New Zealanders working and living in Australia, among other issues.