Phytophthora oak decline; Root rot - Phytophthora quercina
Effective: August 18, 2010 - December 31, 2019
Taxonomic Position: Peronosporales : Pythiaceae
Pest Type: Fungi
Pest Code (NAPIS): FGANPYC
This pest is a member of the following surveys: Oak
These Approved Methods are appropriate for: 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011
Pest Information
Pest is vectored by:
Survey

Approved Method(s)
Method Detail NAPIS Survey Method
Water Sample In situ water sampling with rhododendron leaf baits (preferred method). See details below. 3014 - General Water Sample
Visual Collect soil or root sample from symptomatic trees. 3031 - General Visual Observation
Method Notes:

Survey Recommendations
The following are recommendations for executing the survey using the approved methods for pest surveillance. The recommendations are developed through literature review and consultation with subject matter experts.
Signs:
Symptoms:
Key Diagnostic or Identification

Approved Method(s)
ID/Diagnostic:
Mistaken Identities:
In Progress / Literature-based Diagnostics:
Notes:
References
  1. Gallegly, M.E., and Hong, C. 2008. Phytophthora: Identifying species by morphology and DNA fingerprints. The American Phytopathological Society. APS Press.
  2. Jung, T., Cooke, D.E.L., Blaschke, H., Duncan, J.M., and Osswald, W. 1999. Phytophthora quercina sp. nov., causing root rot of European oaks. Mycological Research 103(7): 785-798.
  3. Nechwatal, J., Schlenzig, A., Jung, T., Cooke, D.E.L., Duncan, J.M., and Osswald, W.F. 2001. A combination of baiting and PCR techniques for the detection of Phytophthora quercina and P. citricola in soil samples from oak stands. Forest Pathology 31: 85-97.
  4. Schena, L., Duncan, J.M., and Cooke, D.E.L. 2008. Development and application of a PCR-based 'molecular tool box' for the identification of Phytophthora species damaging forests and natural ecosystems. Plant Pathology 57: 64-75.
  5. Schena, L., Hughes, K.J.D., and Cooke, D.E.L. 2006. Detection and quantification of Phytophthora ramorum, P. kernoviae, P. citricola, and P. quercina in symptomatic leaves by multiplex real-time PCR.
  6. Schubert, R., Bahnweg, G., Nechwatal, J., Jung, T., Cooke, D.E.L., Duncan, J.M., Muller-Starck, G., Langebartels, C., Sandermann, H., Jr., and Osswald, W. 1999. Detection and quantification of Phytophthora species which are associated with root-rot diseases in European deciduous forests by species specific polymerase chain reaction. European Journal of Forest Pathology 29: 169-188.
  7. Schwingle, B.W., Juzwik, J., Eggers, J., and Moltzan, B. The American Phytopathological Society. May 2007. Phytophthora Species in Soils Associated with Declining and Nondeclining Oaks in Missouri Forests.

If you are unable to find a reference, contact STCAPS@usda.gov. See the CAPS Pest Datasheet for all references.