Dutch elm disease

Dutch elm disease, first found in the U.S. in 1930, has spread throughout North America and has destroyed over half the Elm trees in the northern U.S. More recently, the Emerald Ash Borer, an invasive metallic wood-boring beetle from Asia, has infested and killed more than six million Ash trees in the upper Midwest. Ash trees are one of the most common residential landscape trees.
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