Genetics: Making Elms Compatible

The long, elm-cast shadows that once drifted across campuses and evoked dreams of Main Street, U.S.A., are fading—the victims of Dutch elm disease. Caused by a fungus and carried by bark beetles, the incurable blight was first detected in the U.S. in 1930 and has since spread inexorably across the nation, leaving unsightly stumps in its path. Although most American elms seem doomed, there is now hope that a hardy new breed of elm will rise to take their place.

Aware that the less attractive Siberian elm is highly resistant to Dutch...

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