China has ordered traders to stop purchasing at least seven categories of Australian commodities, ratcheting up tensions with a key trading partner in its most sweeping retaliation yet.

Commodities traders in China won’t be able to import products including coal, barley, copper ore and concentrate, sugar, timber, wine and lobster, according to people familiar with the situation. The government has ordered the halt to begin Friday, one of the people said, asking not to be identified as the information is sensitive.

The notice was verbally relayed to major traders in meetings in recent weeks, one of the people said. Iron ore, Australia’s biggest export to China, won’t be included in the halt, the people said.