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Potatoes at WSU

2004 Late Tri-State Trial Postharvest Evaluations

The postharvest evaluations are intended to identify those clones best suited for the French fry processing industry of the Pacific Northwest. The tuber samples are obtained from the Washington, Idaho, and Oregon field trials for evaluations of storage and processing quality in Pullman. Ten numbered clones and two cultivars were evaluated from each growing location.

AOA95154-1 was the highest scoring entry, with a three state average of 31.7 out of a possible 38 points. It produced light uniform fries from all growing locations when stored for 58 days at 48 and 44°F. It was also resistant to low temperature sweetening during storage at 40°F. It was well liked by taste panelists, appears somewhat resistant to blackspot bruise and bacterial softrot, and maintains a fairly consistent length to width ratio in the different growing locations (similar to 2003).

A98295-3TE was the lowest scoring numbered entry (18.9/38). It produced relatively dark fries following 58 days storage at 44°F and did not recondition well following storage at 40°F.

COA96054-3 produced the roundest tubers, with length to width ratios ranging from 1.24 in Washington to 1.75 in Idaho. AO96164-1 produced ratios ranging from 1.48 to 2.25 and, like COA96054-3, showed a larger growing area influence on tuber shape than the other entries.

PA97B3-2 appears to be somewhat susceptible to blackspot bruise, while A98295-3TE was the most resistant clone in this year’s trials.

On average, entries from the Washington and Oregon trials appeared to be more susceptible to bacterial soft rot than those from Idaho.

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