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¹ E.Ü.Ziraat Fakültesi Bahçe Bitkileri Bölümü, 35100 Bornova İZMİR Viewed : 1472 - Downloaded : 830 This study was carried out to determine the effects of UV-C light application and some other protected treatments on postharvest losses and storage capability of 'Satsuma' mandarins (C. Unshiu Mar.) in 2001- 2003. In the first year of research, different UV-C light durations (0, 10, 15, 20, 25 min) applied and the optimum duration was determined as 10 min. In the second year, the treatments were 10 min of UV-C light alone; calcium and hot water were applications alone and in combination. In both years, fruits were stored at 51oC and 90-95 % RH for 60 days. In the fist year experiment, more than 10 min of UV-C light application reduced the lightness of the fruit peel and with increasing duration intensified the effect. The calcium content of the peels of hot water + calciumclorür treated fruit was increased slightly. In general, all treatments, except the ones in combination with calcium, were found to be effective to control diseases. The hot water treatment of 53oC for 3 min was found to be the most favorable, because besides being good in disease control, it also affected many of the quality parameters positively. Hot water treatment did not have unfavorable effects on fruit quality as UV-C light treatments did. Keywords : Satsuma mandarin, UV-C light, Protected treatments, Storage, Quality