The move follows a series of measures the kingdom has taken since the row erupted on Monday.
The kingdom has suspended educational exchange programs with Canada and moved Saudi scholarship recipients to other countries, while Saudi state airline Saudi said it was suspending flights to and from Toronto.
Saudi Arabia's main state wheat buying agency, the Saudi Grains Organization (SAGO), has told grains exporters it will no longer accept Canadian-origin grains in its international purchase tenders, European traders said.
Canada's Prime Minister Justin Trudeau is expected to hold a news conference in Montreal, where he will be pressed on the diplomatic crisis.
The dispute may damage what is a modest bilateral trade relationship worth nearly US$4 billion (£3.1 billion) a year. Canadian exports to Saudi Arabia totalled about US$1.12 billion in 2017, or 0.2 percent of the total value of Canadian exports.
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