IOWA CITY, Iowa (AP) – Iowa reserve linebacker Shane DiBona will likely miss the 2011 season after injuring his achilles in practice.   The school says DiBona suffered the injury during practice Wednesday and underwent surgery Thursday at the University of Iowa Hospitals and Clinics.  DiBona, a redshirt sophomore from Duxbury, Mass., started two games last season. He was listed as a second-team outside linebacker on a depth chart released last week.  The Hawkeyes open the season on Sept. 3 when they host Tennessee Tech.