Toronto shares hit six-week low as resources drag

(Reuters) - Canada's main stock index fell on Monday, touching a six-week low as energy and other resource shares tumbled alongside commodity prices.

- The Toronto Stock Exchange's S&P/TSX composite index (.GSPTSE) ended down 144.5 points, or 0.89 percent, at 16,094.72.

- The index hit a session low of 16,090.66, its weakest intra-day level since Dec. 15. All but one of the index's 10 main sectors were in negative territory.

- The energy group retreated 1.8 percent as U.S. crude prices settled down 58 cents at $65.56 a barrel, driven lower by a stronger U.S. dollar and rising crude output. [O/R]

- Enbridge Inc (Toronto:ENB.TO - News) was the biggest drag on the index, down 1.5 percent at C$46.35, followed by Suncor Energy (Toronto:SU.TO - News), which declined 1.5 percent to C$45.53.

- The firmer greenback also weighed on gold prices, sending gold producers in Toronto (.SPTTGD) down 3 percent. Barrick Gold (Toronto:ABX.TO - News) fell 2.9 percent to C$17.68. [GOL/]

- Cannabis company Aphria Inc (Toronto:APH.TO - News) fell 5.8 percent to C$18.99 after it said it would buy rival Nuuvera Inc (TSXV:NUU.V - News) for C$826 million ($670 million). Nuuvera jumped 10.4 percent to C$7.73.

- Shares of cannabis companies generally came under pressure following last week's deal between Aurora Cannabis Inc (:ACB.TO) and CanniMed Therapeutics Inc (Toronto:CMED.TO - News), which would create the world's top marijuana producer by market value. Canopy Growth (Toronto:WEED.TO - News) was down 5.7 percent at C$33.10

- The TSX posted nine 52-week highs and three new lows. Across all Canadian issues, there were 73 new 52-week highs and 43 new lows.

- Among the most active Canadian stocks by volume, Bombardier (BBDb.TO) was up 1.7 percent at C$3.60 after a U.S. trade commission on Friday backed the Canadian plane maker in a trade dispute with Boeing (NYSE:BA - News).

- Volume on the TSX index was 200.16 million shares.

(Reporting by Leah Schnurr; Editing by Peter Cooney)