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Where Do We Go From Here? The Challenges of Risk Assessment for Invasive Plants

Published online by Cambridge University Press:  12 June 2017

Peter S. White  and
Allison E. Schwarz
Peter S. White
Affiliation:
North Carolina Botanical Garden and Department of Biology, University of North Carolina at Chapel Hill, Campus Box 3280, Chapel Hill, North Carolina 27599-3280
Allison E. Schwarz
Affiliation:
North Carolina Botanical Garden and Department of Biology, University of North Carolina at Chapel Hill, Campus Box 3280, Chapel Hill, North Carolina 27599-3280
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Abstract

Exotic species invasions in natural areas are one of the most significant threats to biological diversity globally. Pest plants pose a significant problem because they often go undetected until widespread ecological damage has already occurred. Effective control is both uncertain and expensive. However, not all introduced species become invasive, leading to the hope that we can develop risk assessment criteria for new plant introductions. Two recently proposed assessment programs are reviewed, one based on North American woody plants and the other based on Australian pest species, and the challenges in their application are discussed. Among the significant issues are spatial and temporal variation in plant performance that affect the documentation of invasive behavior and the tendency for horticulturists to value traits that produce invasive behavior (rapid growth, early and consistent flowering, lack of pests and diseases, and vegetative persistence). Two policy alternatives are suggested for botanical gardens as examples of models for plant introduction policies that could be adapted to other institutions: the Conservation Aware Garden and the Strict Conservation Garden. The former is based on risk assessment, whereas the latter prohibits movement of species across barriers to their dispersal. Information needs, the importance of international communication, and adaptive management are discussed as elements of a program to reduce the spread of pest invaders.

Keywords

Exotic plant speciesnew plant introductionspest invadersweediness characteristicsAMOARBROTESCITEALAPELONJAPUELOMLAQULYTSAELGANSENJATAAAPEICCR
Type
Symposium
Information
Weed Technology , Volume 12 , Issue 4 , December 1998 , pp. 744 - 751
Copyright
Copyright © 1998 by the Weed Science Society of America 

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