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M.L. Arpaia

Although postharvest handling schemes have improved during recent years, it is still possible to observe considerable variability in fruit quality between individual lots. Preharvest factors such as irrigation, nutrition and pest management practices, as well as rootstock and environmental variables, may greatly influence quality after harvest and may well account for some of the differences between individual lots. The influence of preharvest factors on postharvest quality of tropical and subtropical fruit will be discussed using pertinent examples from the literature. Emphasis will be given to those factors which can be manipulated to improve quality.

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Sanele Fana Kubheka, Samson Zeray Tesfay, Asanda Mditshwa, and Lembe Samukelo Magwaza

the postharvest life of fresh produce and maintain postharvest quality by acting as a barrier against gases, moisture, and solute movement ( Ncama et al., 2018 ; Park, 1999 ). This is achieved by the semipermeable layer formed by coating on the fruit

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Ai-Yu Chang, Richard J. Gladon, Mark L. Gleason, Sharon K. Parker, Nancy H. Agnew, and Dennis G. Olson

Cut Rosa ×hybrida L. `Royalty' flowers were used to determine the efficacy of electron-beam irradiation for increasing postharvest quality and decreasing petal infection by Botrytis cinerea Pers. In an experiment for determining the injury threshold, roses received electron-beam irradiation of 0, 0.5, 1, 2, and 4 kGy. Irradiation dosages ≥1 kGy caused necrosis on petal tissue and decreased postharvest life at 20 °C. In a second experiment to evaluate postharvest quality, roses were irradiated at 0, 0.25, 0.5, 0.75, and 1 kGy. Dosages of 0.25 and 0.5 kGy slowed the rate of flower bud opening for 2 days but did not decrease postharvest quality when compared with nonirradiated roses. Roses that received irradiation dosages of 0.75 and 1 kGy showed unacceptable quality. In a third experiment, roses that had or had not been inoculated with B. cinerea were irradiated at 0, 0.25, 0.5, and 0.75 kGy. Irradiation did not control B. cinerea populations, and rose quality decreased as dosage increased. In a fourth experiment to determine the effect of irradiation on B. cinerea, conidia on water-agar plates exposed to dosages ≤1, 2, and 4 kGy germinated at rates of ≈90%, 33%, and 2%, respectively, within 24 h.

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Joshua D. Klein and Susan Lurie

Commercial, ecological, and agrotechnical considerations have recently renewed interest in the use of physical rather than chemical means to maintain postharvest quality of horticultural crops. This review discusses prestorage heat treatments that protect against physiological disorders, enhance natural resistance to pathogen infection, reversibly inhibit fruit ripening, and permit flexibility in storage temperatures.

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Iftikhar Ahmad, John M. Dole, and Bruno T. Favero

compare the effects of different concentrations of GA 4+7 + BA with GA 4+7 + BA + preservative or a propriety mixture of sugar plus acidifier developed for bulbous flowers [floral bulb preservative (Chrysal Bulb Flower Food)] on postharvest quality and

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W.R. Miller, E.J. Mitcham, R.E. McDonald, and J.R. King

Postharvest quality of `Climax' rabbiteye blueberries (Vaccinium ashei Read) was evaluated after exposure to dosages of 0, 0.75, 1.5, 2.25, or 3.0 kGy gamma irradiation (0.118 kGy·min-1) and after subsequent storage. Irradiation did not affect weight loss, but irradiated berries were softer than nontreated berries. There was also a trend toward increased decay as dose increased. Irradiation had no effect on powdery bloom or surface color; total soluble solids concentration, acidity, and pH were affected slightly. Flavor preference was highest for nonirradiated berries and generally declined as dosage increased. Irradiation at 2.25 and 3.0 kGy resulted in increased levels of xylosyl residues in cell walls, and xylosyl residues were the most abundant cell-wall neutral sugar detected in blueberries. There was no evidence of cell wall pectin loss in irradiated berries. Irradiation at 21.5 kGy lowered the quality of fresh-market `Climax' blueberries.

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Susan S. Han

40 POSTER SESSION 3 (Abstr. 092-104) Postharvest Physiology/Storage/Food Science Monday, 24 July, 1:00-2:00 p.m.

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Chris B. Watkins

Color Atlas of Postharvest Quality of Fruits and Vegetables . Maria Cecilia do Nascimento Nunes. 2008. Wiley-Blackwell, Blackwell Publishing, Ames, Iowa. 480 pages. List price $219.99, Hardcover, ISBN:978-0-8138-1752-1 The quality of harvested

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Manish K. Bansal, George E. Boyhan, and Daniel D. MacLean

.D. Forney, C.F. 2000 Biological effects of corona discharge on onions in a commercial storage facility HortTechnology 10 608 612 Spayd, S.E. Norton, R.A. Hayrynen, L.D. 1984 Influence of sulfur dioxide generators on red raspberry quality during postharvest

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Juan Carlos Díaz-Pérez

of this study were to evaluate the effects of shade level on incidences of Phytophthora blight and Tomato spotted wilt, fruit mineral nutrient content, bell pepper fruit yield, quality, and postharvest attributes. Materials and Methods The study was