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Home → Publications → Seed and Seedling Diseases in the Western US → A Short Review of Fusarium Section Liseola: Implications for Conifer Seedling Production

A Short Review of Fusarium Section Liseola: Implications for Conifer Seedling Production

Species of Fusarium in the section Liseo/a have the same teleomorph (Gibberel/a fujikuro/) and 'similar anamorphic characteristics, including production of microconidia in chains or false heads borne on mono- or polyphialides. None of the species normally produce chlamydospores. Using anamorphic characteristics to separate taxa is difficult, so species have been delineated based on "mating populations: i.e., production of the ascigerous stage when paired with known testers. Anamorphic species designated as F. proliferatum reside in mating populations C and 0; all isolates tested from Pacific Northwest conifer seedlings are in mating population D. Some pathogens formerly designated as F. moniliforme may actually be F. proliferatum; ambiguity can be reconciled using mating population tests and molecular nucleic acid analyses. Based on molecular analyses. F. oxysporum, an important pathogen of bareroot forest nurseries, is most closely related to fungi in the section Liseo/a.


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Author(s): USDA Forest Service