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Potatoes at WSU

2004 Late Regional 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. Fifteen numbered clones and two cultivars were evaluated from each growing location.

A93157-6LS and TC1675-1Ru were the highest scoring clones with a three state average of 30.9/38 and 30.5/38, respectively. A93157-6LS was the second highest scoring entry in the 2003 Regional Trial. This clone has substantial resistance to low temperature sweetening, as evidenced by a USDA rating of “0” following 58 days of storage at 40°F for the Washington- and Idaho-grown crops.


PA95A11-14 and ATX91137-1Ru had the lowest postharvest ratings (16.3/38 and 17.6/38, respectively). Both had relatively low gravities and lacked resistance to low temperature sweetening at 44°F.

A95074-6 was a variety mix in the Washington samples with both white and yellow fleshed tubers.


CO93001-11Ru had broken dormancy on October 28 and sprouts were 2 inches long by the end of December (48°F storage).


ATX91137-1Ru appears to be the most blackspot bruise resistant of this year’s entries.


On average, entries from the Washington and Oregon trials appear to be more susceptible to bacterial softrot than those from Idaho.

ATX92230-1Ru produced round tubers with length to width ratios ranging from 1.45 to 1.49 across states. The average yield of french fries 3 inches in length from 8 to 10 ounce tubers of this entry was 62%.

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