CANADA STOCKS-TSX slips shortly after open, but retailers jump

TORONTO, Sept 7 (Reuters) - Canada's main stock index turned negative shortly after the open on Thursday as strong gains in consumer discretionary stocks failed to offset broader declines in key sectors.

The Toronto Stock Exchange's S&P/TSX composite index fell 18.13 points, or 0.12 percent, to 15,041.70.

Half of the index's 10 main groups were lower. (Reporting by Solarina Ho; Editing by Chizu Nomiyama)