Invasive and Exotic Species
Non-native species and pathogens have caused enormous ecological and economic damage to U.S. forests and grasslands, and they continue to be introduced at an alarming rate. Non-native species have been imported intentionally and unintentionally through world trade and foreign travel, and they have been able to adapt to new environments and spread rapidly. Their success is often due to a lack of both host resistance and natural enemies, allowing them to establish in new environments unimpeded. This has cascading impacts on other species.
Understanding and managing invasive species is critical for protecting and restoring resilient forest and grassland ecosystems. Forest Service research on invasive and exotic species directly advances efforts to rapidly discover and respond to emerging threats. This includes informing government regulations to limit the accidental importation of pests and pathogens, detecting threats as early as possible, and eradicating invasive pests and pathogens when feasible.
The Forest Service invests in research on invasive and exotic species because:
- There are more than 450 known forest insect and pathogen species established in the continental U.S.
- Approximately 2.5 established non-native forest insects were detected in the U.S. each year between 1860 and 2006.
- At least 18 percent of introduced insects and all 16 introduced pathogens have caused tree damage that impacts forest health and productivity and sometimes causes extensive tree mortality. For example, the emerald ash borer is the most damaging invasive forest insect pest in North America, having killed hundreds of millions of ash trees across the U.S. since it was introduced. Forest Service researchers study risk, effects, detection, spread, biology, ecology, control, and management of emerald ash borer as well as other invasive forest insects including gypsy moth, hemlock woolly adelgid, and spotted lanternfly.
- Mortality caused by non-native invasive forest pests impacts carbon dynamics by reducing forests’ carbon sequestration capacity and converting live materials that previously stored carbon to dead carbon sources.
Tools
Past Webinars on Invasive Species
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Webinars
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Webinars
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Webinars
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Webinars
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Webinars
A Snapshot of Research on Invasive Species Around the Country
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Science You Can Use
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Science You Can Use
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Science Findings
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Science Findings
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Science Findings
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Science Findings
CompassLive Articles from the Southern Research Station
Research Working Groups Focused on Invasive Species
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Center or GroupStation
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Center or GroupStationStates
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ProgramStation
Publications
- James H. Miller, Erwin B. Chambliss, Nancy J. Loewenstein. 2010. A field guide for the identification of invasive plants in southern forests (slightly revised 2012, 2013, and 2015)
- Therese M. Poland, Toral Patel-Weynand, Deborah M. Finch, Chelcy Ford Miniat, Deborah C. Hayes, Vanessa M. eds..Lopez. 2021. Invasive Species in Forests and Rangelands of the United States: A Comprehensive Science Synthesis for the United States Forest Sector