Abstract
Abstract Modified atmospheres (MA) generated within cartons of ‘Cox's Orange Pippin’ apples containing 25 µm thick polybags with 50 microperforations, effectively reduced bitter pit and maintained quality in fiuit from a range of growers after storage at 1 ± °C for 6 weeks and 1 week at ambient temperatures. A pilot-scale trial transported to the United Kingdom indicated that the polybag system could be utilised commercially for export of apples in MA conditions. Large scale evaluation of the system on fruit from a number of growers confirmed the effectiveness of the system but suggested that, where background levels of bitter pit exceed 20–30%, neither MA nor commercial postharvest calcium treatments can reduce bitter pit levels to less than 5%. A disorder similar to brown-heart developed in fruit that had been vacuum-infiltrated with CaCl2 followed by storage in microperforated polybags, indicating that this combined treatment would not be commercially viable.
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