Alder root and collar rot - Phytophthora alni
Effective: April 6, 2018
Taxonomic Position: Peronosporales : Pythiaceae
Pest Type: Fungi
This pest is a member of the following lists:

List 2017 2018 2019
Economic and Environmental reference reference reference
This datasheet represents an Approved Method for: 2015, 2016, 2017, 2018, 2019
Major Hosts identified in the CAPS Host Matrix*:
Pest is vectored by:
Approved Method(s):
Survey Instruction Details:
Key Diagnostics
Approved Method(s):

Mistaken Identities:
In Progress / Literature-based Diagnostics:
  1. Adams, G.C. 2007. Baiting methodology for 2007 Phytophthora surveys in Alaska.
  2. Adams, G.C., Catal, M., Trummer, L. 2010. Distribution and severity of alder Phytophthora in Alaska. In: Frankel, S.J., Kleijunas, J.T., and Palmieri, K.M. Proceedings of the Sudden Oak Death Fourth Science Symposium. Gen. Tech. Rep. PSW-GTP-229. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. pp: 29-49.
  3. Bakonyi, J., Nagy, Z.A., and Ersek, T. 2006. PCR-based DNA markers for identifying hybrids within Phytophthora alni. Journal of Phytopathology 154: 168-177.
  4. De Merlier, D., Chandelier, A., Debruxelles, N., Noldus, M., Laurent, F., Dufays, E., Classens, H., and Cavelier, M. 2005. Characterization of alder Phytophthora isolates from Wallonia and development of SCAR primers for their specific detection. Journal of Phytopathology 153: 99-107.
  5. Gallegly, M.E., and Hong, C. 2008. Phytophthora: Identifying species by morphology and DNA fingerprints. The American Phytopathological Society. APS Press.
  6. Ioos, R., Husson, C., Audrieux, A., and Frey, P. 2005. SCAR-based PCR primers to detect the hybrid pathogen Phytophthora alni and its subspecies causing alder disease in Europe. European Journal of Plant Pathology 112: 323-335.
  7. Lane, C.R., Hobden, E., Walker, L., Barton, V.C., Inman, A.J., Hughes, K.J.D., Swan, H., Colyer, A., and Barker, I. 2007. Evaluation of a rapid diagnostic field test kit for identification of Phytophthora species, including P. ramorum and P. kernoviae at the point of inspection. Plant Pathology 56: 341-348.
  8. O'Brien, P.A., Williams, N., and St. J. Hardy, G.E. 2009. Detecting Phytophthora. Critical Reviews in Microbiology 35(3): 169-181.
  9. Olsson, C.H.B. 1999. Diagnosis of root-infecting Phytophthora spp. Doctoral Thesis. Swedish University of Agricultural Sciences.
  10. Streito, J.C., Jarnouen De Villartay, G., and Tabary, F. 2002. Methods for isolating the alder Phytophthora. Forest Pathology 32: 193-196.