August 12 (Reuters) - Canada's main stock index opened lower on Monday, dragged down by a slump in shares of pot producer CannTrust Holdings and as worries that a prolonged U.S.-China trade dispute will lead the global economy into recession kept investors on edge.
At 9:30 a.m. ET (13:30 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 35.54 points, or 0.22%, at 16,305.8.