What happens to infested ash trees?

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The canopy of infested trees begins to thin above infested portions of the trunk and major branches because the emerald ash borer destroys the water and nutrient conducting tissues under the bark. Heavily infested trees exhibit canopy die-back, usually starting at the top of the tree. One-third to one-half of the branches may die in one year. Most of the canopy will be dead within 2 years of when symptoms are first observed.

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