Postharvest Disease Control of Colletotrichum gloeosporioides and Penicillium expansum on Stored Apples by Gamma Irradiation Combined with Fumigation

• Published in: The plant pathology journal Vol. 32; no. 5; pp. 460 - 468
• Main Authors: Cheon, Wonsu, Kim, Young Soo, Balaraju, Kotnala, Kim, Bong-Su, Lee, Byeong-Ho, Jeon, Yongho
• Format: Journal Article
• Language: English
• Published: Korea (South) 한국식물병리학회 01-10-2016; Korean Society of Plant Pathology; Hanrimwon Publishing Company
• Subjects: Colletotrichum gloeosporioides; combination; ethanedinitrile; gamma irradiation; Penicillium expansum; 농학; Penicillium expansum; Colletotrichum gloeosporioides; ethanedinitrile; gamma irradiation; combination
• ISSN: 1598-2254; 2093-9280
• DOI: 10.5423/PPJ.OA.03.2016.0062

To study the control of postharvest decay caused by
and
, 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 of
and
spore germination. The gamma irradiation dose required to reduce the spore germination by 90% was 0.22 and 0.35 kGy for
and
, 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 in
. Treatment with the eco-friendly fumigant ethanedinitrile had a greater antifungal activity against
and
in comparison with the non-treated control under
conditions. The
antifungal 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.