March 2019
Cultivar Corner: Castle Russet has excellent processing qualities

Castle Russet (POR06V12-3)

Parentage: PA00V6-4 x PA01N22-1

Developer: Tri-States Potato Research & Breeding Program (

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.

Agronomic Characteristics

Maturity: Medium to late season

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.


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.

RELATED: Mackinaw shows resistance to PVY, late blight

75 Applewood Dr. Ste. A
P.O. Box 128
Sparta, MI 49345


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