Emerald ash borer (EAB), Agrilus planipennis Fairmaire, is an exotic beetle that was discovered in southeastern Michigan near Detroit in the summer of The adult beetles nibble on ash foliage but cause little damage. The larvae (the immature stage) feed on the inner bark of ash trees, disrupting the tree's ability to transport water and nutrients.
EAB IN THE UNITED STATES. Emerald ash borer (EAB) is a non-native insect pest that infests and kills all species of ash trees in North America. It was first discovered in southeastern Michigan in and EAB has since been found in 27 additional states and 2 Canadian providences.
EAB Life Cycle. The adult Emerald Ash Borer emerges May - July and the female lays numerous eggs in bark crevices and layers. The eggs hatch in days into larvae, which bore into the tree where they chew the inner bark and phloem, creating winding galleries as they feed.