title: Postharvest Disease Control ofColletotrichum gloeosporioidesandPenicillium expansumon Stored Apples by Gamma Irradiation Combined with Fumigation.
abstract: To study the control of postharvest decay caused byColletotrichum gloeosporioidesandPenicillium expansum, gamma irradiation alone or in combination with fumigation was evaluated to extend the shelf life of apples in South Korea. An irradiation dose of 2.0 kGy resulted in the maximum inhibition ofC. gloeosporioidesandP. expansumspore germination. The gamma irradiation dose required to reduce the spore germination by 90% was 0.22 and 0.35 kGy forC. gloeosporioidesandP. expansum, respectively. Microscopic observations revealed that when the fungal spores were treated with gamma irradiation (4.0 kGy), conidial germination was stopped completely resulting in no germ tube formation inC. gloeosporioides. Treatment with the eco-friendly fumigant ethanedinitrile had a greater antifungal activity againstC. gloeosporioidesandP. expansumin comparison with the non-treated control underin vitroconditions. Thein vitroantifungal effects of the gamma irradiation and fumigation treatments allowed us to further study the effects of the combined treatments to control postharvest decay on stored apples. Interestingly, when apples were treated with gamma irradiation in combined with fumigation, disease inhibition increased more at lower (< 0.4 kGy) than at higher doses of irradiation, suggesting that combined treatments reduced the necessary irradiation dose in phytosanitary irradiation processing under storage conditions.
authors.affiliation: Department of Bioresource Sciences, Andong National University, Andong 36729, Korea.
authors.forename: Wonsu
authors.initials: W
authors.lastname: Cheon
authors.affiliation: Department of Bioresource Sciences, Andong National University, Andong 36729, Korea.
authors.forename: Young Soo
authors.initials: YS
authors.lastname: Kim
authors.affiliation: Agricultural Science and Technology Research Institute, Andong National University, Andong 36729, Korea.
authors.forename: Kotnala
authors.initials: K
authors.lastname: Balaraju
authors.affiliation: Dongbu Agricultural Research Institute, Dongbu Farm Hannong Co., Ltd., Nonsan 33010, Korea.
authors.forename: Bong-Su
authors.initials: BS
authors.lastname: Kim
authors.affiliation: Dongbu Agricultural Research Institute, Dongbu Farm Hannong Co., Ltd., Nonsan 33010, Korea.
authors.forename: Byeong-Ho
authors.initials: BH
authors.lastname: Lee
authors.affiliation: Department of Bioresource Sciences, Andong National University, Andong 36729, Korea.
authors.forename: Yongho
authors.initials: Y
authors.lastname: Jeon
keywords: Colletotrichum gloeosporioides; Penicillium expansum; combination; ethanedinitrile; gamma irradiation