TORONTO (Reuters) - The Toronto Stock Exchange's main index closed at its lowest level in five months yesterday, extending the previous day's heavy losses, as resource shares tumbled alongside commodity prices.

The S&P/TSX composite index closed down 241.92 points, or 1.82 percent, at 13,074.86 with all but one of its 10 main sectors on the downside.

The index has plunged more than 600 points over the two sessions, amid deepening fears of a US recession and the possibility of a global economic slowdown.

Resource issues were the biggest culprits yesterday, with the energy and materials sectors shedding three percent and 3.9 percent respectively, yanked lower by declining gold and oil prices amid concerns that economic turmoil could dampen demand for resources.

Potash Corp of Saskatchewan and Suncor Energy were among the biggest net decliners. Potash sank C$7.83, or 5.4 percent, to C$138.00, while Suncor fell C$4.60, or 4.6 percent, to C$96.01.

The index bounced back from earlier lows, when it briefly slid below the 13,000 mark, but it still finished at it lowest level since mid-August.

The tech sector was the lone group on the upside, edging up 0.6 percent, with Cognos Inc adding 52 Canadian cents, or 0.9 percent, to C$58.92.

The heavyweight banking sector was little changed, down 0.01 percent, as some financial shares moved higher.

Toronto-Dominion Bank rose C$1.34, or 2.1 percent, to C$66.50, while Bank of Montreal was down 74 Canadian cents, or 1.3 percent, at C$55.05.