WEST LAFAYETTE, Ind. (AP): A Purdue University entomologist says an invasive insect that's taken a big bite out of Indiana's ash tree populations likely survived the frigid winter with few losses in its numbers. Purdue exotic forest pest educator Adam Witte says the emerald ash borer's larvae only die when temperatures reach minus 28 degrees beneath ash trees' bark. Witte says U.S. Forest Service scientists predict only parts of Minnesota and North Dakota become that cold.