* C$ at C$1.0678 vs US$, or 93.65 U.S. cents * C$ weakens further after Bank of Canada statement * Bond prices mostly lower across maturity curve By Leah Schnurr TORONTO, Dec 4 (Reuters) - The Canadian dollar weakened to a 3-1/2-year low against the greenback on Wednesday after the Bank of Canada issued a more dovish-than-expected policy statement, highlighting the risks of undesirably weak inflation. The loonie started the North American trading day on a weaker foot and selling picked up momentum after the central bank's statement was released, extending recent losses for the battered currency. The Canadian dollar has fallen in five of its last six sessions, dropping through key support levels as investors have turned bearish. In a statement that showed the central bank is increasingly concerned about possible disinflation, the Bank of Canada said the risks of weak inflation now appear greater than they did six weeks ago. Still, the bank added that the balance of risks remained within the range of possibilities it identified in its last policy announcement in October. "It just reinforces the sentiment that it's unlikely we'll see the Bank of Canada act in terms of moving interest rates for all of 2014," said Gareth Sylvester, director at Klarity FX in San Francisco. Wednesday's statement was the first following a policy shift in October, when the central bank dropped any mention of a rate hike, catching markets off guard. Since that October statement, the loonie has lost more than 3 percent. During the period, it has also been pressured by weak oil prices and the prospect that the U.S. Federal Reserve could begin winding down its economic stimulus sooner rather than later. The Canadian dollar ended the North American session at C$1.0678 to the greenback, or 93.65 U.S. cents, weaker than Tuesday's close of C$1.0649 or 93.91 U.S. cents. The loonie eased as far as C$1.0708, its weakest level since May 2010. While technicals suggest the Canadian dollar could be poised for a correction back to the C$1.05 area, the currency could hit C$1.085 in the months ahead, Sylvester said. "We don't think necessarily the market has moved too far, too soon. It has been an orderly grind higher, so I think that supports the fact the U.S. dollar-Canadian dollar could hold on to these rallies." A Reuters poll released before the Bank of Canada's statement on Wednesday showed analysts see no reprieve for the Canadian currency in the coming year, with the loonie forecast to trade at C$1.08 12 months from now. As was widely expected, the central bank also held its key interest rate at 1 percent, where it has been since 2010. October's policy shift has pushed out market expectations for the next rate hike into 2015. Data earlier in the morning showed Canada unexpectedly posted a trade surplus of C$75 million ($70.1 million) in October, the first in 22 months. The Canadian dollar had little reaction to the data. The two-year bond was unchanged to yield 1.071 percent, while the benchmark 10-year bond fell 41 Canadian cents to yield 2.639 percent.