The department asked the court to order the companies to delay closing until an appeal could be heard. It argued that the relief was needed to "protect competition and to preserve the Government's ability to obtain an effective remedy on appeal." It said that if the appeals court does not act that the companies could close on October 3.

U.S. Sugar, which has fought the government to preserve the merger, did not immediately reply to a request for comment.

Judge Maryellen Noreika of the U.S. District Court for Delaware had ruled for the companies on Sept. 23, rejecting the government's request that she stop the deal from going forward.

The case is in the U.S. Court of Appeals for the Third Circuit in Philadelphia.

(Reporting by Diane Bartz; Editing by Chizu Nomiyama)