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Potatoes at WSU

1999 Late Regional Trial Overview

The late Regional trial had 9 entries this year, including the two standard cultivars – Ranger Russet and Russet Burbank. As was indicated for the late harvest Tri-State trial, changes in fry color and reducing sugars during storage at 48oF could not be evaluated for some of the OR-grown Regional trial clones this year, due to a limited number of tubers. Hence, total rating scores for the OR-grown clones are based on a maximum of 25. Where possible, we have indicated the ‘out-of-35’ scores parenthetically to facilitate comparisons across states. However, the average scores over the three states were calculated based on a total possible score of 31.6 for each clone (reflecting the 25 maximum for the OR-grown clones).

The clone that received the highest rating in each state was A9014-2. This entry was the second highest scoring clone in the 1998 Tri-State trial. The French fry taste panel scored A9014-2 as high or higher than the two standard cultivars. It produced light uniform fries prior to storage from all growing locations. Fries made from tubers stored at 44 and 48F for approximately 1.5 months scored 2 or better by USDA standards. Relative to WA- and ID-grown tubers, OR-grown tubers of A9014-2 from 40F storage had the darkest fries, with an average USDA color rating of 3. WA- and ID-grown tubers of this clone fried light enough to be classified as USDA 1.

AO87277-6 received a three state average total rating of 19.9 (out of 31.6). For the second year, its overall score was equal to or better than that of Russet Burbank. AO87277-6 also scored second highest in the 1998 Regional trial. The French fry taste panel scored this clone as high or higher than Russet Burbank in sensory quality.

A8893-1 was the third highest scoring entry with 19.9 points (tied with AO87277-6); however, specific gravity of OR-grown tubers of this clone was at the discard level (less than or equal to 1.070).

CO89036-10 was the lowest rated entry, with only 9.5 of the 31.6 possible points. When grown in OR and ID, this clone produced fries with USDA color ratings of 3 and 4, respectively, prior to storage. The sensory evaluation ratings of this clone ranged from 1.8 to 2.4 of the possible 5 points available for taste, texture, etc.

Length to width ratios for Ranger Russet and Russet Burbank ranged from 1.72 to 2.15. All other entries produced tubers with ratios that were equal to or lower than those produced by these two standard cultivars. AC87084-3 produced the roundest-shaped tubers, with ratios ranging from 1.28 (grown in OR) to 1.67 (grown in ID).

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