* The Toronto Stock Exchange's TSX falls 1.34 percent to 16,553.99
* Leading the index were Descartes Systems Group Inc DSG.TO , up 6.7%, Iamgold Corp IMG.TO , up 6.4%, and Aecon Group Inc ARE.TO , higher by 4.9%.
* Lagging shares were Spin Master Corp TOY.TO , down 38.4%, Secure Energy Services Inc SES.TO , down 8.9%, and Air Canada AC.TO , lower by 8.7%.
* On the TSX 64 issues rose and 161 fell as a 0.4-to-1 ratio favored decliners. There were 5 new highs and 25 new lows, with total volume of 312.6 million shares.
* The most heavily traded shares by volume were Bombardier Inc BBDb.TO , Manulife Financial Corp MFC.TO and Toronto-dominion Bank TD.TO .
* The TSX's energy group .SPTTEN fell 2.89 points, or 2.6%, while the financials sector .SPTTFS slipped 6.20 points, or 2.0%.
* West Texas Intermediate crude futures CLc1 fell 1.84%, or $0.86, to $45.92 a barrel. Brent crude LCOc1 fell 2.27%, or $1.16, to $49.97 O/R
* The TSX is off 3% for the year.