CANADA STOCKS-TSX hits six-week low on China growth concerns

* TSX down 102.32 points, or 0.67 percent, at 15,163.06 * Six of the 10 main index sectors decline * Tekmira jumps after regulators approve Ebola treatment By John Tilak TORONTO, Sept 22 (Reuters) - Canada's main stock index fell on Monday, hitting a six-week low, as worries about China's economic growth and weakness in commodity prices weighed on shares of natural resource producers. A Reuters poll showed growth in the Chinese factory sector probably stalled in September. F