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ARS Home » Pacific West Area » Corvallis, Oregon » Forage Seed and Cereal Research Unit » Research » Publications at this Location » Publication #421413
Research Project: Optimizing and Stabilizing Economic and Ecological Sustainability of Pacific Northwest Seed Cropping Systems Under Current and Future Climate Conditions

Location: Forage Seed and Cereal Research Unit

Title: First report of dollar spot caused by Clarireedia jacksonii on annual bluegrass in western Oregon and pathogenicity testing of multiple turfgrasses

Author
item STARCHIVICK, ROBERT - Oregon State University
item Temple, Todd
item BRAITHWAITE, EMILY - Oregon State University
item SCHMID, CHARLES - Oregon State University
item KOWALEWSKI, ALEC - Oregon State University
item Rivedal, Hannah

Submitted to: Plant Health Progress
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/25/2025
Publication Date: 4/28/2025
Citation: Starchivick, R.J., Temple, T.N., Braithwaite, E.T., Schmid, C.J., Kowalewski, A.R., Rivedal, H.M. 2025. First report of dollar spot caused by Clarireedia jacksonii on annual bluegrass in western Oregon and pathogenicity testing of multiple turfgrasses. Plant Health Progress. https://doi.org/10.1094/PHP-12-24-0166-BR.
DOI: https://doi.org/10.1094/PHP-12-24-0166-BR

Interpretive Summary: This report details the first detection of Clarireedia jacksonni, the dollar spot pathogen, causing disease in Oregon annual bluegrass. This report describes the identification efforts and pathogenicity testing on annual bluegrass and other cool-season grasses. The confirmation of this pathogen in Oregon may have management implications for turfgrass managers of the state.

Technical Abstract: Dollar spot of annual bluegrass (Poa annua), caused by Clarireedia jacksonii has never been formally reported in Oregon. This pathogen is one of the most important turfgrass diseases of cool-season grasses worldwide. In 2023, C. jacksonii was detected on an annual bluegrass putting green in Corvallis, Oregon. This report details the identification efforts, and pathogenicity testing of the recovered isolate on annual bluegrass, creeping bentgrass, perennial ryegrass, and tall fescue. The confirmation of C. jacksonii in Oregon may have management implications for golf course superintendents of the state.