Tag Archives: thousand cankers disease

New disease of walnuts reaches Midwest

A little over one hundred years ago an estimated 4 billion chestnut trees blanketed the eastern hardwood forest of the U.S.  Between 1900 and 1908 an accidentally introduced, and most devastating disease, called chestnut blight, was introduced.  Forty years later, it was nearly impossible to find a single mature chestnut tree in the eastern U.S. The chestnut illustrates the rapid changes possible with invasive pests.  It may, or may not, foreshadow what is about to happen with another important tree, black walnut, Juglans nigra.  One of our most… Read More →