May 7 (Reuters) - Canada's main stock index opened lower on Tuesday, as fresh worries about an escalation in the trade dispute between the United States and China kept investors risk averse.
* At 9:31 a.m. ET (13:31 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 95.3 points, or 0.58 percent, at 16,398.16.