Two enormous ash trees are record holders on the front line of the Emerald Ash Borer in eastern Iowa: the state's largest known white ash, in Fort Madison, and the biggest black ash in the nation, south of McGregor. Medical treatment may be on the way for the national champion black ash. Editor's Note: When rescuers returned to the tree in 2014, they found the prized specimen had fallen over, with no hope of saving it.