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The emerald ash borer lays eggs within the ash wood tree. When the eggs hatch, larvae gnaw at layers beneath the tree's bark, cutting off the tree's nourishment. The larvae can girdle and kill just branches or the entire tree. Emerald Ash borer appears to infest all types of ash trees. In its native range, it is also known to infest Asian walnut and elm species. This insect can kill trees quickly. A confounding factor in looking for this pest is that ash trees have been showing symptoms of decline for more than 25 years. |
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