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Experimental and commercial maturity studies with Granny Smith apples



Experimental and commercial maturity studies with Granny Smith apples



Deciduous Fruit Grower 38(10): 364-367



Data are presented from 4-year trials on (1) changes in the maturity indices of Granny Smith fruits picked at weekly intervals during the period 153-201 days after full bloom; (2) the incidence of core flush after storage at 0 degrees C for 4 months, followed by holding at 20 degrees for 1 week; (3) the predicted and true optimum picking stage of fruits from different areas, and the number of weeks in which fruits of acceptable quality could be picked; (4) the calendar week and number of days after full bloom for reaching optimum picking maturity of fruits from different areas; and (5) variations in different maturity indices for fruits over a period of 5 years at the optimum picking stage. The maturity indices comprised fruit firmness, skin and seed colour, TSS and acid contents, and starch conversion. In the first trial, between 181 and 188 days after full bloom, changes were marked in several of the maturity indices, especially TSS and acid contents, starch conversion and the incidence of core flush. This stage can be predicted fairly accurately 4-4.5 weeks in advance. The optimum picking stage was not confined to 1 week, and fruits could be harvested during a period of 3-4.5 weeks. Differences in maturity occurred between different areas and seasons.

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Accession: 001831639

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