Fungal Systematics and Evolution (2018) 1, 23-39

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T. Aoki, M.T. Kasson, M.C. Berger, S. Freeman, D.M. Geiser and K. O'Donnell (2018)
Fusarium oligoseptatum sp. nov., a mycosymbiont of the ambrosia beetle Euwallacea validus in the Eastern U.S. and typification of F. ambrosium
Fungal Systematics and Evolution 1 (1), 23-39
Abstract: Fusarium oligoseptatum sp. nov. was isolated from the invasive Asian ambrosia beetle Euwallacea validus (Coleoptera, Scolytinae, Xyleborini) and from the galleries that females had constructed in dying Ailanthus altissima (tree-of-heaven) symptomatic for Verticillium wilt in south-central Pennsylvania, USA. This ambrosia fungus was cultivated by Euwallacea validus as the primary source of nutrition together with a second symbiont, Raffaelea subfusca. Female beetles transport their fungal symbionts within and from their natal galleries in paired pre-oral mycangia. Fusarium oligoseptatum was distinguished phenotypically from the 11 other known members of the Ambrosia Fusarium Clade (AFC) by uniquely producing mostly 1–2 septate clavate sporodochial conidia that were swollen apically. Phylogenetic analysis of multilocus DNA sequence data resolved F. oligoseptatum as a genealogically exclusive species-level lineage but evolutionary relationships with other members of the AFC were unresolved. Published studies have shown that F. oligoseptatum can be identified via phylogenetic analysis of multilocus DNA sequence data or a PCR multiplex assay employing species-specific oligonucleotide primers. In addition, to provide nomenclatural stability, an epitype was prepared from an authentic strain of F. ambrosium that was originally isolated from a gallery constructed in Chinese tea (Camellia sinensis) by E. fornicatus in India, together with its lectotypification based on a published illustration.
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Database assignments for author(s): Takayuki Aoki, Stanley Freeman

Research topic(s) for pests/diseases/weeds:
identification/taxonomy
general biology - morphology - evolution


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Euwallacea validus U.S.A. (NE)
Neocosmospora oligoseptata U.S.A. (NE)
Neocosmospora ambrosia Tea (Camellia sinensis) India