Washington State University

Potatoes at WSU

Postharvest Information

Overall Postharvest Rating

Highest scoring clones:  AO96164-1, A93157-6LS, AO96160-3, AOA95155-7

Lowest scoring clones:  ATX91137-1Ru, MWTX2609-2Ru, RB, CO95172-3Ru

Low temperature Sweetening

Most resistant:  A93157-6LS, AO96164-1

Most susceptible:  ATX91137-1Ru, MWTX2609-2Ru, CO95172-3Ru

Taste Panel

Highest rated:  AOA95155-7, A92294-6, AO96160-3, A93157-6LS

Lowest rated:  ATX91137-1Ru, A95109-1, MWTX2609-2Ru, RB

Blackspot Bruise Susceptibility

Most resistant:  AOA95155-7, ATX91137-1Ru

Most susceptible:  RR, MWTX2609-2Ru, A93157-6LS, TXA549-1Ru, CO94035-15Ru

Variability in Tuber Shape & Fry Yield (8- to 10-oz tubers)

Least variable:  ATX91137-1Ru, TXA549-1Ru, CO95086-8Ru, A95109-1

Most variable:  AO96164-1, CO94035-15Ru, A93157-6LS, A92030-5


  • When averaged across states, all entries except ATX91137-1Ru and MWTX2609-2Ru received higher overall postharvest scores than Russet Burbank.
  • AO96164-1 was the highest rated entry, accumulating 34.4 of 38 possible points.  This clone, along with A93157-6LS (2nd highest rated entry), had significant resistance to low temperature sweetening, producing USDA 0 to 1 fries (darkest end) when stored for 60 days at 40oF.  These two clones were rated among the top three in the 2004 trials.
  • ATX91137-1Ru consistently produced tubers with 1.067 specific gravities, too low for processing contracts.  However, this clone, along with AOA95155-7 appears to have considerable bruise resistance.  At the other extreme, the gravity of A92294-6 averaged 1.099, which is too high for most processing contracts.
  • AOA95155-7, A92294-6, AO96160-3, and A93157-6LS were the favorites in the taste panels, receiving ratings of 3.5 to 3.7 (5 is best) when averaged across growing locations.  ATX91137-1Ru, A95109-1, and MWTX2609-2Ru received the lowest taste panel ratings, with average scores of 2.7, 2.8, and 2.9, respectively.
  • On average, the WA-grown samples fried darker than ID and OR samples after 60 days of storage at all three temperatures.  Fry color was non-uniform from bud to stem end for many of the clones, regardless of production site and storage temperature. AOA95155-7 produced mottled fries from all states and storage temperatures.  TXA549-1Ru had random blotches of purple discoloration in the periderm.
  • Bacterial soft rot susceptibility was relatively equal across clones.
  • On average, ID-grown tubers had the highest L/W ratios (8-10 oz tubers) compared with those grown in WA and OR.  TXA549-1Ru, CO94035-15Ru, A92030-5, A95109-1, A93157-6LS, and PA97B3-2 had the lowest L/W ratios (average=1.57), reflecting round tubers.  A92294-6 and AO96164-1 had the highest L/W ratio (1.76) of the numbered entries, well below RB and RR (1.96 and 1.89, respectively).  AO96164-1, CO94035-15Ru, A93157-6LS, and A92030-5 had the greatest variation in shape of 8- to 10-oz tubers across states.  The L/W ratios of ATX91137-1Ru and TXA549-1Ru were least affected by growing location.
Potatoes at WSU, PO Box 646414, Washington State University, Pullman WA 99164-6414, 509-335-9502
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