Grain workers at Canada’s biggest port went on strike Tuesday over a dispute regarding hours and pay, setting up what an industry association called a “devastating” situation for farmers during the harvest season.

Workers at grain terminals located in the Canadian port of Vancouver went on strike on Tuesday, Labour Minister Steven MacKinnon said in a post on social media. "At my request, parties have agreed to resume negotiations alongside federal mediators,

Picket lines have gone up at six grain terminals in Metro Vancouver as about 600 workers begin a strike. Canada’s labour minister, meanwhile, says he spoke with both the employer and representatives of Grain Workers Union Local 333 on Monday, and they have agreed to resume contract negotiations alongside federal mediators.

Workers at the six main grain terminals located in the Canadian port of Vancouver went on strike on Tuesday, a move that could disrupt exports of canola and other crops, government and industry officials said.

The walkout on Canada’s west coast is the latest in a string of labor actions to hit the country’s supply chains.

Saskatchewan grain farmers say their busy harvest season could be derailed after workers at six major grain export terminals in Metro Vancouver walked off the job Tuesday morning, and are urging Ottawa to do more to prevent future supply chain disruptions.