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POSTERS: Integrated Pest Management II

P-304 - Managing Potato Pink Rot Through Varietal Resistance and Fungicides

Tuesday, August 5, 2025
9:30 AM - 10:15 AM HST
Location: Exhibit Hall 3
Abstract Text: Potato pink rot (Phytophthora erythroseptica) is a major soilborne disease that significantly impacts potato production. Effective management strategies are crucial for reducing yield losses and maintaining potato quality. This study aimed to evaluate the efficacy of various fungicides and assess the resistance of commercial potato varieties and breeding clones to pink rot. Field trials were conducted at the Aroostook Research Farm in Presque Isle, ME, over multiple years. Two mefenoxam-sensitive strains of P. erythroseptica were cultivated in the vermiculite-based V8 medium. Each plant was applied at planting at 80 ml inoculum in-furrow. Orondis Gold DC (5.5% oxathiapiprolin), Elumin (7.5% mandipropamid), and Ridomil Gold (48% metalaxyl-M) had control efficiencies ranging from 26.5% to 93.2%, 25.2% to 43.3%, and 37.1% to 82.3%, respectively. Furthermore, in-furrow applications of Revus (2.08% mandipropamid) are more effective than seed treatments at the recommended volume. These findings provide essential data for optimizing fungicide applications for potato pink rot management. For potato variety testing, potato varieties Atlantic, Snowden, Dark Red Northland, and Russet Norkotah, exhibited higher levels of tolerance to pink rot. Additionally, breeding clones such as AAF10596-1, AAF11546-3, AAF14025-2, AAF15010-1, and AF3317-15 demonstrated better tolerance than other germplasms. These findings contribute to the development of effective management practices and the selection of resistant cultivars to mitigate the impact of pink rot on potato production.