Overall Postharvest Rating
Highest scoring clones: AO98133-2, A97142-3, and A97287-6
Lowest scoring clones: RB, A96023-6, and A96108-12
Low temperature Sweetening
Most resistant: AO98133-2, A97142-3, and A97287-6
Most susceptible: A96023-6, and A96108-12
Highest rated: AO98133-2, AO96141-3, and A97142-3
Lowest rated: RB, and A96023-6
Blackspot Bruise Susceptibility
Most resistant: A98104-4, A96108-12, and AO96141-3
Most susceptible: RR, AO98133-2, and A97142-3
Variability in Tuber Shape & Fry Yield (8- to 10-oz tubers)
Least variable: AO96141-3, AOA98133-2, and A96023-6
Most variable: A98104-4, A97229-1, and A97287-6
- The specific gravity rating scale was updated to reflect contract penalties for undesirably low as well as high gravities (see Materials and Methods). For example, WA-grown AO96141-3 produced a gravity of 1.000, which received a low score of “1” under the new system (rather than a high score of “5” under the old system).
- When averaged across states, all entries received higher overall postharvest scores than Russet Burbank. However, A97229-1, Ranger Russet, A96023-6, and A96108-12 scored lower than Russet Burbank when grown in WA.
- AO98133-2 was the highest rated entry, scoring 33.7 out of 38 points. This clone had significant resistance to low temperature sweetening, with ID- and OR-grown samples producing USDA 0 fries and the WA-grown samples producing USDA 1 and 2 fries when stored for 60 days at 40 and 44oF, respectively.
- A98104-4 had specific gravities ranging from 1.066 to 1.077; too low for most processing contracts. At the other extreme, the gravities of AO96141-3 were 1.096 and 1.100 when grown in OR and WA, respectively, which were too high for most contracts.
- A97142-3, AO96141-3, and AO98133-2 were the favorites in the taste panels, receiving ratings of 3.5 to 4.0 from all growing locations. A96023-6 received the lowest “flavor” rating, resulting in an overall three-state taste score average of 3.0.
- On average, the WA-grown samples fried darker than ID- and OR-grown samples after 60 days of storage at all three temperatures. A97287-6 and AO98133-2 fried with USDA “0” from 40oF from ID and OR. A97142-3 may also have resistance to sweetening at 40oF; however, uniformity of color (stem-bud) may be an issue in this clone.
- In controlled bruising studies, ID-grown samples bruised less than samples from OR and WA. A98104-4, A96108-12 and AO96141-3 were the most bruise resistant. 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. A97142-3, A96108-12, and A98104-4 had the lowest L/W ratios (average=1.65). AO96141-3 had the highest L/W ratio (2.06). A98104-4, A97229-1, and A97287-6 showed the greatest variation in shape across growing locations. The L/W ratios of AO96141-3, AO98133-2, and A96023-6 were least affected by growing location.