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Scald Prediction Model for 2000
The appearance of storage scald has been related to orchard temperature during the final weeks of fruit maturation. It has been shown that as the fruit is exposed to increasing periods of temperature below 50° F, the susceptibility to scald decreases. Dr. Eric Curry of the USDA-ARS has shown that when starch content is less than 3 (0 to 6 scale) and 150 hours below 50° F have NOT accumulated, scald potential is likely to remain high. If the starch progresses beyond 3, then maturity will begin to override the requirement for cool temperature and scald susceptibility will decrease. Generally, an uninterrupted accumulation of 150 or more hours below 50° F will result in fruit with low scald potential.

Click here to see the 3-D and 2-D Scald Models

Scald Prediction Model for North Central Washington
Scald Hrs*
Station
PAWS Site
*Accumulated hours below 50° F from August 15 to October 31, 2000
506
Baker Flat 4 mi N of Wenatchee, WA; elevation=599 ft
583
Brewster 3 mi SW of Brewster, WA; elevation=600 ft
734
Ellisforde 0.5 mi N of Ellisforde, WA; elevation=892 ft
632
Oroville 0.75 mi E of Oroville, WA; elevation=912 ft
648
Pogue Flat 1.5 mi NW of Omak, WA; elevation=1218 ft
571
Quincy 4 mi W of Quincy, WA; elevation=1427 ft
729
Tonasket 1 mi S of Tonasket, WA; elevation=862 ft
564
WSU TFREC TFREC, Wenatchee, WA; elevation=730 ft

Scald Prediction Model for South Central Washington
Scald Hrs*
Station
PAWS Site
*Accumulated hours below 50° F from August 15 to October 31, 2000
720
Ahtanum 10 mi W of Union Gap, WA; elevation=1560 ft
424
CBC-Pasco CBC-Pasco, Pasco, WA; elevation=339 ft
625
Cowiche 0.5 mi W of Cowiche, WA; elevation=1770 ft
710
Ellensburg 8.2 mi SE of Ellensburg, WA; elevation=1856 ft
393
Finley 1.5 mi S of Finely, WA; elevation=755 ft
612
Gleed 1.5 mi NNW of Gleed, WA; elevation=1476 ft
483
Mattawa 5.4 mi SE of Mattawa, WA; elevation=781 ft
762
Moxee 1.5 mi E of Moxee, WA; elevation=1036 ft
433
Parker 1 mi NW of Parker, WA; elevation=876 ft
451
Paterson 5 mi E of Paterson, WA; elevation=359 ft
643
Pomona 0.5 mi E of Pomona, WA; elevation=1360 ft
481
Royal City 0.5 mi N of Royal City, WA; elevation=1078 ft
513
Sunnyside 4.2 mi N of Sunnyside, WA; elevation=876 ft
472
Walla Walla 1 mi E of Walla Walla, WA; elevation=1186 ft
591
Wapato 3.2 mi W of Wapato, WA; elevation=849 ft

About the PAWS Site
This scald prediction data is provided courtesy of the Washington State University--Public Agricultural Weather System (PAWS). These tables will be updated at least twice weekly from August 15 through November 1.

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Monday, September 19, 2005