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Ultraviolet light treatment has been used successfully to reduce postharvest fungal decay in tomatoes, strawberries, peaches, and citrus, presumably through elevated spore death and/or increased phytoalexins. The purpose of this experiment was to determine the effectiveness of UVC light as a postharvest treatment for blueberries. `Blue Crop' and `Collins' fruit were harvested from a local grower in 2003 and 2004 and exposed to 0, 1000, 2000, and 4000 Joules of light (354 nm) supplied from 30-W germicidal bulbs. Fruit were held at 5 °C for 14 days. Application of 1000 to 2000 J UVC light reduced decay incidence by 10% compared to controls. The major decay organism was ripe rot ( Collectotrichum gloeosporioides ). Total phenolics, total anthocyanin, and ferric reducing absorbance power differed with variety, increased with storage, and were similar among light treatments. Firmness of non-decayed fruit was not affected by storage or treatment. Application of UVC light offers a means for reducing fungal decay in blueberries if applied at rates between 1000 and 4000 J.

(191) UVC Light Treatment Reduces Decay of Blueberries