CARTERET, N. J. -- Di Giorgio Corp. here said it has promoted five senior officers, effective immediately. Robert Zorn, previously senior vice president/treasurer, has been named executive vice president/treasurer. Lawrence Grossman has been promoted from vice president/corporate controller to senior vice president/chief financial officer. Jack Zumba, previously vice president, has been named senior vice president. John Annetta, formerly vice president, frozen division, has been promoted to senior vice president, frozen division. John Fantozzi, formerly vice president, dairy division, has been promoted to senior vice president, dairy division.