Feb 23 (Reuters) - Canada’s main stock index opened lower on Tuesday, dragged down by weakness in material stocks, on worries that a spike in inflation could dent a vaccine-led economic recovery. * At 9:30 a.m. ET (14:30 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was down 109.37 points, or 0.59%, at 18,307.37. (Reporting by Amal S in Bengaluru; Editing by Aditya Soni)