Canada's largest agribusiness is no longer able to ship canola to China.

Sources report a recent Chinese customs document shows Richardson International had its registration cancelled to export canola.

The Canola Council of Canada said in a statement there's no clear evidence the cancellation is linked to frictions between the two countries.

The farm group says news about blocked exports hurts the whole value chain.

The Council says they're aware of challenges their exporters are facing shipping to China, which creates instability and adds costs.

According to the Council, about 40 per cent of Canadian canola and canola product exports go to China.

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