FHTET Products - Phytophthora alni Risk Maps

Invasive Pest Risk Maps

Phytophthora disease of alders- Phytophthora alni ssp alni

Phytophthora 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 map Sample 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	153 KB	3 MB
Establishment Potential	96 KB	2.4 MB
Susceptibility Potential	114 KB	3 MB
Survey Sample Area	170 KB	466 KB
Alaska	Preview	PDF
Introduction Potential		1.33 MB
Establishment Potential		2.53 MB
Susceptibility Potential		2.5 MB
Methods Maps and Text PDF files of how each map was produced.
Contiguous US		PDF
Introduction Potential		3.3 MB
Establishment Potential		2.7 MB
Susceptibility Potential		3.3 MB
Survey Sample Area		4.0 MB
Metadata FGDC Standards PDF/DOC files.
Contiguous US		PDF
Introduction Potential		58 KB
Establishment Potential		294 KB
Susceptibility Potential		307 KB
Survey Sample Area
GIS Grids Compressed as ZIP files.
Contiguous US		ZIP
Introduction Potential		553 KB
Establishment Potential		1.17 MB
Susceptibility Potential		1.10 MB
Survey Sample Area		1.73 MB
Alaska		ZIP
Introduction Potential		77 KB
Establishment Potential		167 KB
Susceptibility Potential		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:

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