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Animated graphic of scary-looking tree that is moving up and down.Title graphic that says: Nightmare on Elm Street, The Happy Sequel....Animated graphic of another scary-looking tree that is moving up and down.

In the early 1940s the nightmare began. Dutch elm disease started spreading rapidly from one elm tree to another. The disease is caused by a fungus. A fungus can't walk or fly, but bugs known as Dutch elm beetles could. And they did, traveling throughout the land, carrying the fungus like an invisible hitchhiker.

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