TORONTO - Canada's main stock index edged lower in late-morning trading amid weakness in the key materials sector and the health-care sector, which includes many of the big names in the marijuana industry.

The S&P/TSX composite index was down 3.57 points at 15,629.76.

In New York, the Dow Jones industrial average was down 47.33 points at 25,059.00. The S&P 500 index was down 0.97 of a point at 2,706.91, while the Nasdaq composite was up 4.95 points at 7,303.15.

The Canadian dollar traded for 75.12 cents US compared with an average of 75.36 cents US on Friday.

The March crude contract was down US$1.20 at US$51.52 per barrel and the March natural gas contract was up nine cents at US$2.67 per mmBTU.

The April gold contract was down US$6.80 at US$1,311.70 an ounce and the March copper contract was down 2.80 cents at US$2.78 a pound.