NCHRP Synthesis 363: Control of Invasive Species
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NCHRP Synthesis 363:
Control of Invasive Species
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TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 363: Control of Invasive Species explores the extent to which state departments of transportation are identifying actions that affect the spread of invasive species, preventing introduction, tracking status and locations of "invasives" in a timely and ongoing manner, controlling found populations, restoring invaded habitats, conducting research, and sharing lessons learned. The report documents successful practices and lessons learned. It also synthesizes the state of the practice in developing Integrated (Roadside) Vegetation Management, along with physical, chemical, biological, and cultural control mechanisms.


  • Transportation — Highways
  • Transportation — Maintenance and Preservation
  • Transportation — Environment

Publication Info

126 pages | 8.5 x 11

Table of Contents

skim chapter
Front Matter i-ix
Summary 1-2
Background and Role of Transportation in Spread and Control of Invasive Species 3-3
Organization 4-4
Rising Costs Imposed by Invasive Species 5-5
Federal Context, Priorities, and Drivers in Invasive Species Control 6-7
State and Local Context and Priorities 8-8
State Department of Transportation Drivers, Priorities, and Challenges 9-11
Assessment and Management 12-13
Planning for Invasives Control 14-14
Integrated Roadside Vegetation Management 15-19
Setting Priorities 20-20
Prevention 21-22
Department of Transportation Prevention Activities 23-27
Early Detection and Rapid Response 28-30
Statewide Inventory of Invasive or Noxious Species in Right-of-Way and Update of Databases 31-33
Information Management and Decision Support Systems in Early Detection and Rapid Response 34-37
Gathering Information About Control Options 38-38
Biological Control of Invasive Species 39-42
Mechanical Controls 43-47
Physical Methods 48-51
Chemical Methods 52-55
Cultural Controls 56-63
Summary of Department of Transportation Survey Results - Popular and Innovative Control Strategies 64-65
Department of Transportation On-Line Roadside Maintenance Guidance, Manuals, and Procedures 66-66
Involvement of Various Department of Transportation Branches and Divisions 67-70
Finding Assistance and Technical Support 71-71
Partnerships Identify and Control New and Existing Populations 72-75
Dealing with Private Property Issues 76-76
Obstacles to Effective Coordination 77-77
Departments of Transportation Lessons Learned Regarding Internal Communication and Ownership 78-78
Training Approaches 79-79
Public Outreach 80-80
Educational Resources, Information Sources, and Databases 81-82
Gaps in and Opportunities for Greater Effectiveness in Invasive Species Control 83-84
Further Needs and Research Areas 85-86
References 87-91
Glossary 92-94
Appendix A - Survey Questionnaire 95-105
Appendix B - Respondents to Survey Questionnaire 106-106
Appendix C - Sample New York State Department of Transportation Invasive Species Inventory Forms 107-109
Appendix D - Overview of Common Integrated Roadside Vegetation Management or Integrated Vegetation Management Steps 110-113
Appendix E - State Department of Transportation Research Related to Invasive Species Control 114-115
Abbreviations used without definitions in TRB publications 116-117

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