The US and China have extended their trade truce for another 90 days, just hours before the world's two biggest economies were set to raise tariffs on imports of each other's goods. On Monday, US President Donald Trump signed an executive order to keep the pause in place until 10 November, while Beijing also announced an extension.

China’s Ministry of Commerce announced on Tuesday that a preliminary 75.8 per cent duty on Canadian canola seed would go into effect on Thursday, sending canola futures on the Intercontinental Exchange down as much as 6.

The levy would be a blow for Canada’s agricultural sector, as canola represents the biggest cash crop for farmers.

China has decided to place tariffs on Canadian rapeseed imports following an anti-dumping probe, disrupting crop flows and adding to a trade spat between the two sides.