First Report of the Root-Rot Pathogen, <i>Armillaria nabsnona</i>, from Hawaii
Bibliographic record
Abstract
The genus Armillaria (2) and Armillaria mellea sensu lato (3) have been reported previously from Hawaii. However, Armillaria species in Hawaii have not been previously identified by DNA sequences, compatibility tests, or other methods that distinguish currently recognized taxa. In August 2005, Armillaria rhizomorphs and mycelial bark fans were collected from two locations on the island of Hawaii. Stands in which isolates were collected showed moderate to heavy tree mortality and mycelial bark fans. Pairing tests (4) to determine vegetative compatibility groups revealed three Armillaria genets (HI-1, HI-7, and HI-9). Rhizomorphs of genet HI-1 were collected from both dead and healthy mature trees of the native 'Ohia Lehua (Metrosideros polymorpha) approximately 27 km west of Hilo, HI (approximately 19°40'49″N, 155°19'24″W, elevation 1,450 m). Rhizomorphs of HI-7 and HI-9 were collected, respectively, from dead/declining, mature, introduced Nepalese alder (Alnus nepalensis) and from an apparently healthy, mature, introduced Chinese banyan (Ficus microcarpa) in the Waipi'o Valley (approximately 20°03'29″N, 155°37'35″W, elevation 925 m). On the basis of somatic pairing tests and intergenic spacer-1 (IGS-1) nucleotide sequence identities of 99 to 100% with North American A. nabsnona (GenBank Accession No. AY509178), HI-1 (GenBank Accession No. DQ995356), HI-7 (GenBank Accession No. DQ995358), and HI-9 (GenBank Accession No. DQ995359) were identified as A. nabsnona, a pathogen of hardwoods (1). The IGS-1 sequences of A. nabsnona genets (HI-1, HI-7, and HI-9) had a greater similarity to North American collections of A. nabsnona than to the Asian A. nabsnona, even though the two introduced hosts originated from Asia. Phylogeographic studies could help determine the potential introduction and original source of A. nabsnona in Hawaii. Although A. nabsona was isolated from multiple hosts in declining stands, pathogenicity studies are needed to confirm whether this pathogen causes disease on diverse native and exotic tree species in Hawaii. References: (1) E. Allen et al. Pages 2-7 in: Common Tree Diseases of British Columbia. Natural Resources Canada. Canadian Forest Service, Victoria, BC, Canada, 1998. (2) D. E. Hemmes and D. E. Desjardin. Pages 129 and 153 in: Mushrooms of Hawaii. Ten Speed Press, Berkeley, CA, 2002. (3) F. F. Laemmlen and R. V. Bega. Plant Dis. Rep. 58:102, 1974. (4) Y. Wu et al. USDA Forest Service Tech. Rep. R2-58, 1996.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".