2024/10/08 by Mio Satoh-Cruz, Stefanie Rhodes, Damen Kurzer +2 · 1 voice
Agricultural and Biological Sciences · #Plant Disease Resistance and Genetics #Plant Pathogens and Resistance #Plant Virus Research Studies
paper · doi:10.1094/php-06-24-0063-s
openalex publication_date 2024/10/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/22
Potato virus Y (PVY) is a complex of multiple strains that cause a variety of foliar and tuber symptoms. Several current strains have potential to result in variety-dependent yield and quality losses. Understanding the local PVY strain population and variety responses are critical for detection and management. From 2019 to 2023, PVY strain composition was monitored across seven Michigan seed potato-producing counties growing prevalent chip, russet, and tablestock market classes. Using multiplex reverse-transcriptase polymerase chain reaction (RT-PCR) methods, PVY strains were identified from potato tuber or leaf samples collected through the certification program ( n = 78 positive lots). PVY N-Wi remained most prevalent in Michigan, but tuber necrotic strains PVY NTN and PVY E also continued to be detected. These, as well as some PVY N-Wi isolates, are known to cause necrotic symptoms in tubers, causing yield and quality reductions for susceptible potato cultivars. As in other U.S. potato-growing regions, PVY N-Wi and PVY NTN were most prevalent in Michigan seed potato lots. Of note, mild to severe tuber necrosis was observed in diagnostic samples positive with local PVY N-Wi strains. Parental strain PVY O appeared to re-emerge in 2023 and should be considered in certification and management. Mild or asymptomatic reactions may still lead to yield or quality losses and may pose a risk to more susceptible cultivars. Due to the diversity of strains and varieties prevalent in the Great Lakes region, continued uniform certification is recommended. Information gathered from this and future survey efforts will be valuable for growers, inspectors, and future breeding and selection efforts.