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POSTERS: Virology I

P-599 - Surveying for viruses in alfalfa fields in Oregon, California, and Idaho

Monday, August 4, 2025
4:30 PM - 5:15 PM HST
Location: Exhibit Hall 3
Abstract Text: Alfalfa (Medicago sativa L.) is a major forage crop in Oregon, California, and Idaho, covering 350,000, 480,000, and 1,090,000 acres, respectively, in 2023. Despite its economic importance, no surveys of alfalfa viruses have been conducted in Oregon for the past 30 years, leaving a knowledge gap in the Pacific Northwest. To address this, a survey was conducted from July 15 to September 5, 2023, collecting 139 leaf samples from 13 fields in Oregon, four in Southern Idaho, and four in Northern California. Four viruses were detected: three aphid-transmitted viruses—alfalfa mosaic virus (AMV), bean leafroll virus (BLRV), and pea streak virus (PeSV)—and one virus with an unknown vector, Snake River alfalfa virus (SRAV). Prevalence varied among the viruses, ranging from 0% to 43% for PeSV and from 0% to 100% for BLRV, AMV, and SRAV. Notably, while SRAV was previously reported in Idaho and Washington, this study marks the first detection of SRAV in alfalfa crops in Oregon and Northern California.