TORONTO — Shopping for groceries the other afternoon at his neighborhood supermarket here, Victor Meunier reached for a head of broccoli — then reconsidered. It had been imported from the United States. Meunier ditched the broccoli and reached for a package of mushrooms with a different label: “Product of Canada.” kAmxE H2D 2 D>2== 24E @7 C6D:DE2?46 282:?DE E96 %CF>A 25>:?:DEC2E:@? 2?5 :ED DF556? FA6?5:?8 @7 E96 =@?8E:>6 2==:2?46 36EH66?