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There are native species of Agrilus in Michigan as well.  This is why it is important to know how to identify the Emerald Ash Borer correctly to the species level.
Larvae feed in the area between the bark and the wood and adults feed on ash foliage.  Adults do not feed on ash foliage in sufficient quantities to kill the trees.
Kilned - wood that has been heated to sufficient temperatures to kill pests and pathogens using it as a host.
Treated – to treat with chemicals (e.g., pesticide) to kill pests and pathogens.
A more detailed diagram with explanations may be included in your biology textbook.  If not, consult a botany, plant physiology or forest ecology textbook.
Some pictures are included on the USDA Pest Alert sheet.  More can be found at www.emeraldashborer.info and the following slide…
These are fields that experts are researching to find ways to control EAB and to determine our current ash resource in Michigan and other states.  Genetic research is taking place in order to determine the genetic diversity of the pest.  The less diversity, the more likely it is to be vulnerable to a certain pesticide or natural enemy, such as a microbial disease.  Other states have an advantage over Michigan because they can prepare themselves for the arrival of EAB and determine if they are able to set up any geographical barriers to stop it.
Moving wood that has not been prepared properly can artificially spread EAB.  Lack of a variety of trees and other plants in the urban forest leaves it more vulnerable to new pests and diseases.  Many streets have been planted with only one kind of tree (e.g., ash).  In such areas, a new pest or disease could destroy them all.