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Alternaria Spots in Tomato Leaves Differently Delayed by Four Plant Essential Oil Vapours
Res. Plant Dis. 2018;24:292-301
Published online December 31, 2018
© 2018 The Korean Society of Plant Pathology.

Jeum Kyu Hong1*, Yeon Sook Jo1, Dong Hyun Ryoo1, Ji Hwan Jung1, Hyun Ji Kwon1, Young Hee Lee1, Seog Won Chang2, and Chang-Jin Park3

1Department of Horticultural Science, Gyeongnam National University of Science and Technology (GNTech), Jinju 52725, Korea
2Department of Golf Course Management, Korea Golf University, Hoengseong 25247, Korea
3Deparment of Bioresources Engineering, Sejong Univerity, Seoul 05006, Korea
*Tel: +82-55-751-3251 Fax: +82-55-751-3257 E-mail: jkhong@gntech.ac.kr ORCID https://orcid.org/0000-0002-9161-511X
Received October 31, 2018; Revised November 14, 2018; Accepted November 14, 2018.
cc This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Alternaria leaf spot disease has been a concern during a tomato production in greenhouse. In vitro antifungal activities of vapours of four plant essential oils, cinnamon oil, fennel oil, origanum oil and thyme oil, were investigated during in vitro conidial germination and mycelial growth of Alternaria alternata causing the tomato leaf spots to find eco-friendly alternatives for chemical fungicides. The four plant essential oils showed different antifungal activities against in vitro conidial germination of A. alternata in dose-dependent manners, and cinnamon oil vapour was most effective to suppress the conidial germination. The four plant essential oils showed similar antifungal activities against the in vitro mycelial growth of A. alternata in dose-dependent manners, but low doses of thyme oil vapour slightly increased in vitro mycelial growth of A. alternata. Necrotic lesions on the A. alternata-inoculated tomato leaves were reduced differently depending on kinds and concentrations of plant essential oils. Delayed conidial germination and germ-tube elongation of A. alternata were found on the tomato leaves treated with cinnamon oil and origanum oil vapours at 6 hpi. These results suggest that volatiles from cinnamon oil and origanum oil can be provided as alternatives to manage Alternaria leaf spot during the tomato production eco-friendly.
Keywords : Alternaria alternata, Disease management, Eco-Friendly, Plant essential oil vapour, Tomato


December 2018, 24 (4)