2007 - Potatoes at WSU - Washington State University

LTS
2007 Late Harvest Tri-State Trial
Post Harvest Performance
‣ Overall Postharvest Rating
Highest scoring clones: A98345-1, AO96305-3
Lowest scoring clones: RB, PA98NM39-1, PA00N15-2
‣ Low Temperature Sweetening
Most resistant: AO96305-3, A96814-65LB, A98345-1, PA99N82-4, PA99N12-1
Most susceptible: PA98NM39-1, PA00N15-2, RB
‣ Taste Panel
Highest rated: A96814-65LB, PA99N82-4, AO96305-3
Lowest rated: PA98NM39-1, PA00N15-2, PA99N2-1
‣ Blackspot Bruise Susceptibility
Most resistant: A0008-1TE, A99073-1, PA00N15-2
Most susceptible: A96814-65LB, RR, A98345-1, PA00N14-2
‣ Variability in Tuber Shape & Fry Yield (8- to 10-oz tubers)
Least variable: PA00N14-2, RR, RB
Most variable: PA99N82-4, A98345-1, PA98NM39-1
Details
• When averaged across states, all entries except PA98NM39-1 received higher overall
postharvest scores than Russet Burbank.
• A98345-1 and AO96305-3 were the highest rated entries, scoring 33.8 and 33.7 out of 38 points.
These clones, along with A96814-65LB, PA99N82-4 and PA99N12-1, had significant resistance
to low temperature sweetening, with WA and ID grown samples producing USDA 0 fries when
stored at 40 o F (44 days). Processing quality of the OR-grown samples of these clones ranged
from an acceptable USDA 0-2, except for PA99N12-2 which produced unacceptable USDA 3 fries
when stored for 44 days at 40 o F.
• PA00N15-2, RB and PA98NM39-1 received the lowest overall postharvest scores (21.9/38,
19.6/38 and 18.6/38, respectively).
• The average gravity of A99073-1 was 1.073, too low for most processing contracts. At the
other extreme, A97066-42LB averaged 1.097 (range = 1.096-1.106) which is too high for most
contracts and consistent with results from last years trials (avg.= 1.101). A96814-65LB tubers
from WA and ID also had excessively high gravities (avg.= 1.099).
• From all growing locations, A96814-65LB, PA99N82-4 and AO96305-3 were the favorites in the
taste panels, receiving ratings of 3.8 to 3.7 (5 is best). Approximately 93% of variation in taste
panel scores was explained by differences in gravity among the clones this year. A96814-65LB
produced severe after-cooking darkening from all states and storage temperatures. PA98NM39-
1, PA00N15-2 and PA99N2-1 had the lowest taste panel scores of 2.2, 2.9, and 2.9, respectively.
2007 Potato Cultivar Evaluations 36 WSU Potato Research Group