CHICAGO -- Weed killer was mistakenly put on a suburban Elgin high school football field, and now the team has to decide where to play its home games.According to the Elgin Courier-News , the company that maintains the field at St. Edward High School meant to put fertilizer on the grass. About two thirds of the field was affected.A decision on where football games will be played is expected by Thursday after the players have had a chance to practice on the field.