ISHS Acta Horticulturae 485: International Symposium Effect of Pre- & Postharvest factors in Fruit Storage
A PREDICTION MODEL FOR SUPERFICIAL SCALD DEVELOPMENT ON GRANNY SMITH APPLES AFTER COLD STORAGE |
| Authors: | A.F. Lourens, A. Malherbe |
| Abstract:
Fruit maturity indicators, skin macro-elements and hexane skin extracts of ‘Granny Smith’ apples from four areas in the Western Cape region of South Africa were recorded at harvest over three picking dates for 4 consecutive years. The variables were analysed for significant correlation with superficial scald incidence assessed after 4 months of cold storage. Starch conversion as maturity index and  -farnesene, conjugated triene hydroperoxides and optical density at 200 nm (anti-oxidant activity) in hexane extracts correlated significantly with superficial scald incidence, but with some variation between the harvest areas.
Mg and K were the only macro-elements that showed some association with superficial scald.
Accumulative preharvest temperature units recorded in the field, and days from full bloom to harvest were also analyzed and good associations with superficial scald were found.
Stepwise regression analyses were used to generate superficial scald prediction models.
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