July 25 (Reuters) - Canada's main stock index dropped at the open on Thursday after three straight days of gains, as investors adopted a wait-and-watch approach following a mixed corporate earnings reports.
* At 9:32 a.m. ET (1332 GMT), the Toronto Stock Exchange's S&P/TSX Composite index .GSPTSE was down 25.24 points, or 0.15%, at 16,586.6.