DES MOINES – The emerald ash borer (EAB), a destructive and invasive insect of ash trees has been discovered in central rural Montgomery County. Iowa’s growing number of counties with confirmed detections has now reached twenty-seven. Native to Asia, EAB has spread to 25 states since first being identified in Michigan back in 2002. This exotic pest is responsible for the death of tens of millions of ash trees. Click for current map of infestations.