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Seasonal changes affect chilling sensitivity in Atemoya (Annona cherimola Mill.x A. squamosa L.)

Smith L.G. , Meiburg G.F. and Barker J.A.

Horticulture Postharvest Group Queensland Horticulture Institute, 19 Hercules St Hamilton Queensland Australia 4007.

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Seasonal changes affect chilling sensitivity in Atemoya (Annona cherimola Mill.x A. squamosa L.)

Postharvest chilling injuries resulting from 0, 0.6, 1, 2 and 3 days at 0,4, 7, and 10 ฐC (chilling temperatures) were recorded throughout the three-month harvesting season of atemoya (‘custard apple’). After subsequently ripening at 22ฐC, chilling injuries as skin blackening were quantified in relation to the temperature and harvest date. Fruit developed unacceptable chilling injury (>30% skin area blackened) if stored for longer than 15 hrs at 0 or 4ฐC, or 48 hours at 7ฐC. Skin blackening at 10ฐC was never more than 20%. Internal quality was unaffected. Skin blackening from identical treatments at the eight different harvest dates showed major variation, typically from 4-50% skin area blackened. Because of such variation, precise recommendations on short-term sub-optimal storage durations are difficult, but may possibly be predictable. Injury data over the season were correlated to field temperature, rainfall, and humidity at harvest. The intensity of chilling injury correlated best to relative humidity at harvest (R2 = 0.73; p = 0.01).