Invasive Species Introduced Unintentionally

A worse risk may be the IAS that are introduced unintentionally, such as disease organisms that can devastate an entire tree species that is being used to restore a habitat. The Dutch Elm disease (Ophiostoma ulmi and O. nova-ulmi) and the American chestnut blight (Cryphonectria parasitica) in North America are notorious examples. Pests can have profound economic impact on native forests or plantations, such as gypsy moths (Lymantria dispar) or long-horned beetles (Anoplophora glabripennis). The economic impact of such pests amounts to several hundred million dollars per year.420 Much of this economic toll is felt in forested ecosystems, even within well-protected national parks.

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