White Pearl (W1355-1)

Percentage– Snowden x S440¹

Breeder– Cross and selection was made at the Rhinelander Agricultural Research Station, University of Wisconsin-Madison in 1991; released for production by the Potato Breeding Program at the University of Wisconsin-Madison in 2002¹

Maturity-Late-season¹

Usage– Chipping¹

Plant– Medium size, semi-erect growth habit with two to four medium size, green stems with medium anthocyanin coloration and weak stem wings per plant; delayed canopy closure due to slow emergence¹

Leaves– Medium to dark green, small, open, sparse pubescence; terminal leaflets are ovate with pointed tips, heart shaped bases and medium wavy margins; three pairs of small to medium, broadly ovate primary leaflets; three pairs of secondary and tertiary leaflets; green petioles with weak anthocyanin coloration¹

Flowers– Star shaped, white with yellow anthers; three to four flower clusters per plant; minimal pollen and berry production¹

Tubers– Round, small to medium size with smooth, light buff colored, netted skin^1,2; white flesh; six to nine shallow to medium deep, evenly distributed eyes per tuber; medium specific gravity; medium to late tuber dormancy¹

Strengths– High level of resistance to cold sweetening and produces excellent fry color^1,2; yields more uniform size tubers with little internal or external defects as compared to Snowden; tolerant of rimsulfuron and sulfentrazone exposure¹

Weaknesses– Susceptible to early blight, late blight, pink rot and soft rot; moderately susceptible to common scab, Verticillium wilt and bacterial ring rot; sensitive to metribuzin exposure, drought stress; high percentage of blackspot bruise and shatter bruise can occur at lower storage temperatures; variable tuber size distribution can occur however can be controlled through altering production practices¹

References: ¹Groza, H. I. 2006. White Pearl-A Chipping Potato Variety with High Level of Resistance to Cold Sweetening. American Journal of Potato Research 83:259-267. ²https://plantbreeding.wisc.edu/about/germplasm-developed/potato/

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Last Revised: 5/8/19

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This article was posted in Fact Sheet.