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The American chestnut trees in Connecticut were reduced to understory shrubs by an imported fungus that causes lethal cankers. Chestnut blight disease was first reported in the United States in 1904, and in Connecticut in 1907. Hypovirulence is a virus disease of the fungus that reduces its virulence enough to allow the defense systems of the trees to restrict the fungus to the outer bark. Blight...
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