|Adult Emerald ash borer with size reference|
and characteristic trunk damage (Freshfromflorida.com)
Since adult EAB’s are capable of flying up to a mile at a time in search of new host trees, they are quite hard to contain and that mobility coupled with their fast reproductive cycle means that this pest has the potential to spread incredibly rapidly through a stand of trees. After EAB eggs hatch on the bark of the ash trees, the newly emerged larva travel through the bark and into the phloem of the tree where they proceed to feed and grow for about 1000 days before emerging as adults. This extended period of hidden growth means that it’s possible for a tree to show no outward sign of infestation for long periods of time even though it is filled with thousands of Emerald Ash Borers larva. This allows the beetles to persist unseen and untreated until it is too late to help the infested tree. Once a tree is infested with those larva, its survival rate drops to zero as the Ash Borers starve the tree by consuming its sugar transporting phloem cells (Poland, 2006).
Prediction of future EAB spread (US Forest Service).
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