WSU CAHNRS

Washington State University

Potatoes at WSU

Results 2006

2006 Postharvest Evaluations




Summer Postharvest Potato Evaluations


Early Tri-State

Early Regional Trial

Red & Specialty Trial




Fall/Winter Postharvest Potato Evaluations


The new specific gravity rating scale has been used again this year, reflecting the changes in industry grower contracts. All other evaluation rating scales and methods are the same as shown on the home page.

    The new scale is as follows:

  • 5 = 1.083 – 1.088
  • 4 = 1.081 – 1.082 & 1.089 – 1.091
  • 3 = 1.080 & 1.092 – 1.093
  • 2 = 1.078 – 1.079 & 1.094 – 1.095
  • 1 = 1.076 – 1.077 & 1.096 or higher
  • 0 = 1.075 or lower

In addition to our percentage of black spot bruise we have added a color rating scheme this year. The bruises that rate 3, 4 or 5 are used in the percentage calculation. The color columns are an average of all impacts

    The rating system is as follows:

  • 1 = No bruise
  • 2 = White Knot bruise
  • 3 = Less than 50% of the impact area darkened
  • 4 = Greater than 50% of the impact area darkened or the whole area is light brown
  • 5 = Full impact area is dark

2006 Growing Season Temperatures 

Late Harvest Tri-State Evaluations

Tuber & French Fry Photos from Washington, Idaho and Oregon.

Late Harvest Regional Trial Evaluations

Tuber & French Fry Photos from Washington, Idaho and Oregon.

Potatoes at WSU, PO Box 646414, Washington State University, Pullman WA 99164-6414, 509-335-9502
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