NEW YORK, Oct 18 (Reuters) -
* The Toronto Stock Exchange's S&P/TSX .GSPTSE fell 125.77 points, or 0.81 percent, to 15,404.13.
* Leading the index were Interfor Corp IFP.TO , up 6.5 percent, Barrick Gold Corp ABX.TO , up 4.4 percent, and Atco Ltd ACOx.TO , higher by 4.1 percent.
* Lagging shares were Trican Well Service Ltd TCW.TO , down 6.7 percent, Birchcliff Energy Ltd BIR.TO , down 6.6 percent, and Alamos Gold Inc AGI.TO , lower by 5.8 percent.
* On the TSX 68 issues rose and 173 fell as a 0.4-to-1 ratio favored decliners. There were 2 new highs and 22 new lows, with total volume of 268.3 million shares.
* The most heavily traded shares by volume were Aurora Cannabis Inc ACB.TO , Aphria Inc APH.TO and Bombardier Inc BBDb.TO .
* The TSX's energy group .SPTTEN fell 2.74 points, or 1.54 percent, while the financial sector .SPTTFS slipped 2.87 points, or about 1 percent.
* West Texas Intermediate crude futures CLc1 fell 1.45 percent, or $1.01, to $68.74 a barrel. Brent crude LCOc1 fell 0.89 percent, or $0.71, to $79.34 O/R
* The TSX is off 5 percent for the year.