ISHS Acta Horticulturae 379: International Symposium on Quality of Fruit and Vegetables: Influence of Pre- and Post- Harvest Factors and Technology
EFFECT OF DATE OF HARVEST, ANTIOXIDANTS, GROWTH REGULATORS AND STORAGE CONDITIONS ON SCALD DEVELOPMENT OF “IMPERIAL DOUBLE RED DELICIOUS” APPLES |
| Authors: | M.D. VASILAKAKIS, S.V. MANSEKA |
| Abstract:
The effect of date of harvest, application of DPA, Vit. E, GA3, 2,4-D as postharvest treatments, storage conditions and duration of storage on the development of scald symptoms on I.D.Red Delicious apples were studied during the period 1992–93. The susceptibility of apples to scald was decreasing as the date of harvest was progressing. However, even apples harvested very late(Oct.,2) showed scald symptoms(43%) after a storage period of 210 days at 0 °C. DPA(2000 ppm) applied, as a dip, after harvest resulted in smaller % of apples with scald than the control (56 and 86%, respectively), after a storage period of 150 days. However, apples that treated with DPA but stored for a period of 210 days were affected by scald(100%). Vit. E(2000 ppm), GA3(500 ppm), 2,4-D(500 ppm) or combination of GA3 and 2,4-D(500+500ppm) before transferring the apples to storage rooms did not have any effect on scald development. Late harvested apples, that proved to be resistant to scald, contained higher levels of antioxidants and they remained so until the end of the storage period(May,15). In contrast, in early harvested apples not only lower levels of antioxidants but also a big decrease(75%) was noticed from Jan. to April. Under ULO conditions, 30–40% of apples showed only light symptoms of scald in May. ULO apples contained very low levels of trienes until the end of storage period, irrespective of the date of harvest. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
