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46 POTATO GROWER | JULY 2018 THE In this month's Smorgasbord, with the help of our friends at the Tri-State Breeding and Research Program, we get to know Castle Russet, a medium- to late-maturing variety with high full-season yield of oblong-long, heavy-russeted tubers with higher dry matter content and cold sweetening resistance than those of standard russet varieties. Check www.pvmi.org for a full list of seed growers HISTORY • Parentage: PA00V6-3 × PA01N22-1 • Developed by Tri-State Breeding and Research Program, released in 2018 • PVP applied for in 2018 MANAGEMENT • Management guidelines similar to Russet Burbank • Planting: 9- to 11-inch seed piece spacing with rows spaced 34 to 36 inches apart • Medium to large tuber size profile similar to Ranger Russet under full growing season • Higher yields at 350 to 400 pounds of nitrogen fertilizer per acre than at low nitrogen input • Fertility needs similar to Russet Burbank STRENGTHS • High late-season yields of U.S. No. 1 tubers • Appearance and culinary qualities make it a suitable candidate for fresh market production. • Extremely resistant to potato virus Y, corky ring spot caused by tobacco rattle virus, and potato mop top virus • Greater resistance to Fusarium dry rot, common scab and most internal and external defects than Russet Burbank • Resistant to Metribuzin WEAKNESSES • Prone to hollow heart in early harvest trails • Higher glycoalkaloids under certain growing conditions than standard cultivars STORAGE • Moderate dormancy, 50 to 60 days shorter than Russet Burbank • Good fry quality when stored between 40 and 48 degrees • Susceptible to shatter bruise • Higher resistance to blackspot bruise than standard cultivars S M O R GA S B OR D S M O R GA S B OR D CASTLE RUSSET