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First report of Tobacco necrosis virus causing the ABC disease on potato tubers in Bulgaria.

Bobev, S. G. ; Jonghe, K. de ; Maes, M.

Plant Disease 2018 Vol 102 No. 4 pp. 829-830;


At the end of 2015, ABC disease-resembling symptoms were found on freshly stored potato tubers in the region of Varna, in northeastern part of Bulgaria. Approximately 5% of the tubers (cultivar Melody) were damaged and possessed varying sized sections with (i) dark brown raised patches, (ii) dark sunken lesions, and (iii) light brown cracked patches. When a portion of symptomatic potato tubers was placed in a fridge at 3-4°C in darkness, the necrotic lesions became darker, but no other or supplementary symptoms had developed after nine months of storage. Based on double antibody sandwich ELISA screening and RNA sequencing, the causal agent was identified as Tobacco necrosis virus (TNV). The ABC disease and its pathogen (TNV) were found in Europe, first some decades ago in the Netherlands, then in Italy, and most recently in Sweden. This is thought to be the first report of TNV on potato tubers in Bulgaria.