CULTIVAR CORNER Castle Russet OVERVIEW Parentage: PA00V6-4 x PA01N22-1 AGRONOMIC CHARACTERISTICS Maturity: Medium to late season Developer: Tri-States Potato Research & Breeding Program (www.pvmi.org) Plant Variety Protection: Applied for in 2018. Strengths: Cold sweetening resistance with excellent processing qualities; tubers with reduced polyphenol oxidase activity; high tuber yield and percentage No. 1. Disease resistance includes potato virus Y (PVY), mop-top virus, tobacco rattle virus, corky ringspot, fusarium dry rot and soft rot. Resistant to herbicide Metribuzin. Weaknesses: Moderate but acceptable glycoalkaloid levels; hollow heart; susceptible to shatter bruise. MORPHOLOGICAL CHARACTERISTICS Plant: Semi-erect, medium-sized vines that mature mid to late season. Flower color is white with sterile pollen. Tubers: Oblong-long, heavy-russeted tubers with higher dry matter content; moderate dormancy (50 to 60 days shorter than Russet Burbank). Typically produces medium to large tuber size profile similar to Ranger Russet under full growing season. 20 Spudman.com Tubers: Castle Russet produces oblong-long, large tubers with brown russet skin. Castle Russet tubers have shallow eyes that are intermediate in number and are evenly distributed. Tuber set is medium. Yield Potential: High Specific Gravity: High Culinary Quality: Excellent Diseases/Physiological Disorders: Resistant to PVY, corky ringspot and potato mop-top virus; moderately resistant to fusarium dry rot and common scab. Incentives for Production: Excellent processing qualities. MANAGEMENT Fertility: Needs are similar to Russet Burbank. Castle Russet tends to produce higher yields at 350 to 400 pounds N/acre than at low N input. Planting: 9- to 11-inch seed piece spacing with rows spaced 34 to 36 inches apart. Seed Availability: Limited amounts of G1 seed available from Klamath Falls Research Station.http://www.pvmi.org http://www.Spudman.com