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I could see numerous patches of discoloured canola plants, 
but there was no discernable pattern.

Crop advisor casebook: Mystery of the discoloured canola

A Crop Advisor's Solution from the February 18, 2020 issue of Grainews

Back in mid-June, I got a call from Dave, a grain farmer near Elie, Man., who was concerned about the condition of the plants in one of his canola fields. Dave, who also grows wheat, soybeans and flax on his 3,200-acre farm, said some of the canola plants started exhibiting discoloured leaves shortly after emergence. […] Read more