(Bloomberg) — Syngenta Group’s plan for an initial public offering has hit a roadblock after the Shanghai Stock Exchange suspended the company’s application pending an update to information about its earnings. .The bourse, which posted a notice on its website about the halt on Sept. 30, didn’t say when the Switzerland-based seed and fertilizer business can resume its application to list on the Nasdaq-style Star Board. .Syngenta has now furnished the Shanghai exchange with the requested earnings documentation and an update on the IPO timeline is set to be given this week, a person familiar with the transaction said..China National…