Root rot - Gymnopus fusipes
Effective: August 18, 2010 - December 31, 2014
Taxonomic Position: Agaricales : Omphalotaceae
Pest Type: Fungi
Pest Code (NAPIS): FICBGFI
This pest is a member of the following surveys: Oak
These Approved Methods are appropriate for: 2014, 2013, 2012, 2011
Pest Information
CAPS Pest Datasheet: https://download.ceris.purdue.edu/file/
Pest Tracker: https://pesttracker.org/pest/FICBGFI
Pest is vectored by:
No known vector.
Survey
Approved Method(s)
| Method | Detail | NAPIS Survey Method |
|---|---|---|
| Visual | Collect root and crown samples. | 3031 - General Visual Observation |
Method Notes:
In an effort to detect the pathogen early, roots of trees on sandy soils that are not waterlogged should be inspected for root rot. Soil should be removed from the root collar and major roots to a depth of 20-30 cm [8-12 in] and 80-100 cm [32-39 in] from the base of a tree. Samples of potentially infected roots should be collected from up to 12 locations.
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:
The base of trees can be inspected for the fruiting bodies (basidiomes) of G. fusipes.
Symptoms:
Similar to some other oak pathogens, including deterioration of the crown and root rot.
Key Diagnostic or Identification
Approved Method(s)
ID/Diagnostic:
Morphological:
A. To confirm the presence of the pathogen, orange-yellow sapwood or white mycelium should be placed on semi-selective MAT medium (15 g agar, 10 g malt, 250 mg thiabendazole, 100 mg penicillin, 100 mg streptomycin, and 1 L distilled water).
B. The cultural and morphological characteristics of the basidiomes of the fungus are examined and compared.
Halling (2004) provides a useful key to confirm the genus Gymnopus.
A. To confirm the presence of the pathogen, orange-yellow sapwood or white mycelium should be placed on semi-selective MAT medium (15 g agar, 10 g malt, 250 mg thiabendazole, 100 mg penicillin, 100 mg streptomycin, and 1 L distilled water).
B. The cultural and morphological characteristics of the basidiomes of the fungus are examined and compared.
Halling (2004) provides a useful key to confirm the genus Gymnopus.
Mistaken Identities:
Other species of Gymnopus and similar fungi are found on oak in the U.S. Final identification will require sequence analysis.
In Progress / Literature-based Diagnostics:
Recent molecular evidence supports the placement of Collybia fusipes within the genus Gymnopus (Antonin et al., 1997). The placement of C. fusipes within Gymnopus, however, is not universally accepted and several authors continue to use Collybia fusipes.
References
- Antonin, V., and Noordeloos, M.E. 1997. A monograph of Marasmius, Collybia, and related genera in Europe. Part 2: Collybia, Gymnopus, Rhodocollybia, Crinipellis, Chaetocalanthus, and additions to Marasmiellus. UGW-Verlag Munich.
- Halling, R. E. 2004. A revision of Collybia s.l. in the northeastern United States & adjacent Canada. Institute of Systematic Botany, The New York Botanical Garden.
If you are unable to find a reference, contact STCAPS@usda.gov. See the CAPS Pest Datasheet for all references.