(Adds portfolio manager comment, updates prices to close) * TSX ends down 64.27 points, or 0.42 percent, at 15,399.24 * Eight of the TSX's 10 main groups move lower * Index slips 0.1 percent in February, after hitting record high By Alastair Sharp TORONTO, Feb 28 (Reuters) - Canada's benchmark stock index fell on Tuesday, its fifth straight losing session, as Bank of Nova Scotia led losses in the heavyweight financial banking sector after reporting quarterly earnings in line with expectations. Scotiabank shares fell 2.8 percent to C$77.04, while rival Bank of Montreal rose 2.2 percent to C$100.79 after its numbers smashed past analyst estimates and it announced a major share buyback plan. The financials group, which accounts for 35 percent of the index's weight, fell 0.7 percent overall.