Developing Optimal Controlled Atmosphere Conditions for ‘Thompson Seedless’ Table Grapes
2003
Crisosto, C.H. | Garner, D. | Crisosto, G.
Efficacy of controlled atmosphere (CA) conditions for decay control in ‘Thompson Seedless’ table grapes was evaluated. Early (16.5% soluble solids content = SSC) and late harvested (19% SSC) grapes were exposed to 5, 10, 15, 20 and 25% CO2 combined with 3, 6 and 12% O2. Grapes were initially SO2 fumigated and air stored grapes were used as controls. Storage atmospheres did not affect SSC, TA, SSC:TA, or berry shatter. The main storage limitations for early harvested ‘Thompson Seedless’ table grapes were rachis and berry browning development, which resulted from exposure to >10% CO2. However, ≥15% CO2 was needed to control total decay and nesting development independent of O2 concentrations. CA was more effective in decay control without detrimental effects on quality when late harvested grapes were used. The combination of 15% CO2 with 3, 6 or 12% O2 is suggested for up to 12 weeks storage only for late harvested ‘Thompson Seedless’ table grapes; CA should not be used for early commercially harvested grapes.
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