Invasive species apt to greatly change our outdoor ecosystems

When I was a youth many roads and streets were lined by towering American elm trees, but during the 1950s and Ď60s an invasive disease called Dutch Elm Disease (DED) began killing them. Scientists believe that the fungus that causes DED originally came from the Himalayas.† It travelled to Europe from the Dutch East Indies in the late 1800s. In the 1930s, the disease spread to North America on wooden crates made with infected elm wood. Today itís rare to find a native elm still alive and growing.




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