Why a north American tree is invasive in Europe.
Article Type: Brief article
Subject: Invasive species (Research)
Scientists (Research)
Pub Date: 02/01/2010
Publication: Name: Agricultural Research Publisher: U.S. Government Printing Office Audience: Academic; General Format: Magazine/Journal Subject: Agricultural industry; Biotechnology industry; Business Copyright: COPYRIGHT 2010 U.S. Government Printing Office ISSN: 0002-161X
Issue: Date: Feb, 2010 Source Volume: 58 Source Issue: 2
Topic: Event Code: 310 Science & research
Product: Product Code: 8520110 Scientists NAICS Code: 54171 Research and Development in the Physical, Engineering, and Life Sciences
Geographic: Geographic Scope: United States Geographic Code: 1USA United States
Accession Number: 242015829
Full Text: Black cherry trees are native to the United States, but they now also thrive in Europe, where they are considered an invasive species. In the United States, damping-off disease, which is caused by the soil pathogen Pythium, keeps black cherry trees in check. Researchers collected soil randomly around black cherry trees in more than 20 forests throughout their range in the United States and nearly 20 forests throughout Germany, France, Belgium, and The Netherlands. They then tested the virulence of Pythium isolates from each sample and used DNA sequencing to identify each isolate.

They found that some nonaggressive Pythium types were common in both ranges, but aggressive types were found only among samples obtained in the United States. Additional research indicates that the density and distribution of black cherry trees is significantly greater in European forests than in U.S. forests.

These combined findings suggest that black cherry trees in Europe are invasive partly because these new populations have escaped virulent Pythium species. Kurt O. Reinhart, USDA-ARS Livestock and Range Research Laboratory, Miles City, MT 59301; (406) 874-8211, kurt.reinhart@ ars.usda.gov.
Gale Copyright: Copyright 2010 Gale, Cengage Learning. All rights reserved.