At least 13 Australian sectors have been subjected to Chinese tariffs or some form of disruption, including beef, coal, copper, cotton, lobsters, sugar, timber, tourism, universities, wine, wheat and wool.
The US representative and the Canadian minister also discussed the protracted litigation over Canadian lumber. Washington believes that this wood is sold below the market price to promote exports.
Anxious about China's powerful state-owned enterprises, the United States, European Union and Japan are pushing for curbs on industrial subsidies they say distort the global economy.
Beijing ought to be aware that its policies not only affect rich nations who are are complaining but also developing countries, the WTO head said.
The Ottawa Group, which brings together the EU and 12 countries including Brazil, Canada and Switzerland, will meanwhile demand that countries commit not to hinder the flow of medical goods during the pandemic, and remove customs duties on those considered essential.
The European Commission said in response to the move that it "regrets that the United States has chosen to add further EU products to its retaliation list in the WTO Airbus case on aircraft subsidies."
The WTO panel handling challenges brought by China, the European Union, India, Norway, Russia, Switzerland and Turkey had previously said its final report would not be before autumn 2020.
The US administration of former President Donald Trump set duties in 2018 of 25% on incoming steel.
Washington backed Nigerian former finance minister Ngozi Okonjo-Iweala on Friday, reversing its previous opposition and prompting her to express optimism about her appointment.
"Ngozi will be announced at the next General Council," said a delegate. It was not clear when that council would be.
Still, proponents of the zone are confident that initial steps towards its implementation will already allow member states to double intra-African trade by 2025.
He said Pakistan has agreed to provide opportunities to Afghanistan trade items through Gwadar and Bin Qasim Ports in a good gesture to enhance the economic ties.