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Postharvest quality of early season grapefruit after forced-air vapor heat treatment

Miller, W.R. and McDonald, R. E.

HortScience Vol: 27 Issue: 5 Pages: 422-424.

1992

บทคัดย่อ

Postharvest quality of early season grapefruit after forced-air vapor heat treatment.

'Marsh' and 'Ruby Red' grapefruit (Citrus paradisi Macf.) were harvested in Florida during Oct. and Nov. 1990, degreened in an ethylene chamber, exposed to vapor heat (VH) treatment (43.5 +/- 0.1 degrees C for approximately 240 min), and evaluated for deterioration in quality and development of injury after various storage regimes. Symptoms of aging averaged 6% and 8% of the surface on 'Ruby Red' and 'Marsh' fruit, respectively, and the VH treatment had reduced the incidence of aging by 45% after 5 weeks of storage (4 weeks at 16 degrees C plus 1 week at 21 degrees C). Total decay, mostly stem-end rots (Diplodia spp. and Phomopsis spp.), remained relatively low (approximately 5%) in both treated and nontreated fruit after 5 weeks of storage. The NM treatment had little effect on change in peel color during treatment or subsequent storage. After the final inspection, 'Marsh' fruit was higher in total soluble solids and titratable acidity than 'Ruby Red' fruit, but these quality indicators and pH were not affected by the VH treatment. VH treatment did not adversely affect the quality of 'Marsh' or 'Ruby Red' grapefruit harvested early in the season; hence, VH should be considered as a viable quarantine treatment for Florida grapefruit.