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Invasive Pest Risk Maps
Phytophthora disease of alders- Phytophthora alni ssp alni

Phytophthora alni photo by Thomas JungPhytophthora alni is a recently hybridized soil and waterborne pathogen causing root and collar rot of species of the genus Alnus (alder). Once introduced, the pathogen spreads naturally with streams, floods, and other drainage water.

Phytophthora alni ssp alni risk mapSample Areas were developed using the Susceptibility Surface. A total of 1,200 sample areas were assigned to one of four risk categories. Relative certainties were assigned to each category in order to create increasing plot intensifications for increasing risk stratums.

PDF format links require the Adobe Acrobat Reader to view.
Risk Maps
Contiguous US Preview PDF
Introduction Potential Picture Preview 153 KB Adobe Acrobat Reader PDF file 3 MB
Establishment Potential Picture Preview 96 KB Adobe Acrobat Reader PDF file 2.4 MB
Susceptibility Potential Picture Preview 114 KB Adobe Acrobat Reader PDF file 3 MB
Survey Sample Area Picture Preview 170 KB Adobe Acrobat Reader PDF file 466 KB
Alaska Preview PDF
Introduction Potential   Adobe Acrobat Reader PDF file 1.33 MB
Establishment Potential   Adobe Acrobat Reader PDF file 2.53 MB
Susceptibility Potential   Adobe Acrobat Reader PDF file 2.5 MB
Methods
Maps and Text PDF files of how each map was produced.
Contiguous US   PDF
Introduction Potential   Adobe Acrobat Reader PDF file 3.3 MB
Establishment Potential   Adobe Acrobat Reader PDF file 2.7 MB
Susceptibility Potential   Adobe Acrobat Reader PDF file 3.3 MB
Survey Sample Area   Adobe Acrobat Reader PDF file 4.0 MB
Metadata
FGDC Standards PDF/DOC files.
Contiguous US   PDF
Introduction Potential   Adobe Acrobat Reader PDF file 58 KB
Establishment Potential   Adobe Acrobat Reader PDF file 294 KB
Susceptibility Potential   Adobe Acrobat Reader PDF file 307 KB
Survey Sample Area    
GIS Grids
Compressed as ZIP files.
Contiguous US   ZIP
Introduction Potential   Zip file 553 KB
Establishment Potential   Zip file 1.17 MB
Susceptibility Potential   Zip file 1.10 MB
Survey Sample Area   Zip file 1.73 MB
Alaska   ZIP
Introduction Potential   Zip file 77 KB
Establishment Potential   Zip file 167 KB
Susceptibility Potential   Zip file 153 KB

Pest Risk Assessment Information:
Exotic Forest Health Website (ExFor)

Forestry Images:
Phytophthora alni (Website)

Steering Committee Members:

Conterminous United States:
Marla C. Downing, FHTET Lead
Daniel M. Borchert, APHIS PPQ
Kerry Britton, USFS Research
Frank H. Koch, USFS SRS
Frank J. Krist Jr., USFS FHTET
Frank J. Sapio, USFS FHTET
Bill D. Smith, USFS SRS
Borys M. Tkacz, USFS FHP
Robert C. Venette USFS NRS

Alaska:
Marla C. Downing, FHTET Lead
Lori Trummer, FHP R10

Contact
Marla C. Downing
Biological Scientist
Email:

Related Topics

    Anoplophora glabripennis
    Ips typographus
    Orthotomicus erosus
    Sirex noctilio
    Agrilus auroguttatus
    Agrilus biguttatus
    Agrilus planipennis
    Agrilus sulcicollis
    FHTET Invasive Species Sample Design Tool
    National Insect and Disease Risk Maps (NIDRM)
    SPB Hazard Maps
    Insect and Disease Aerial Detection Surveys (ADS)
    Forest Pest Conditions
    Exotic Forest Health Website

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