Abstract
Tomato leaves showing severe leaf spot symptoms have been observed and sampled in the central west and southwest Taiwan during 2015 and 2016. The symptoms were similar to those of bacterial leaf spot/late blight diseases, but only Stemphylium-like fungi were consistently isolated from the diseased tomato. Upon spray inoculation of tomato, Stemphylium-like isolates caused leaf spot symptoms identical to those of naturally infected plants, and the pathogenic isolates were successfully re-isolated from inoculated leaves. The tomato-pathogenic isolates were identified as S. lycopersici based on morphological characterization and molecular identification. S. lycopersici has been previously reported to cause gray leaf spot of tomato in the temperate regions, but the majority of S. lycopersici-caused lesions were black/dark brown rather than gray in our surveillance. Accordingly, it is suggested that S. lycopersici-caused disease of tomato is named Stemphylium leaf spot of tomato more appropriately than tomato gray leaf spot. Moreover, S. lycopersici-caused leaf spot disease on tomato has been distributed in major tomato production regions in Taiwan. The information provided by our study will be important for future breeding of tomato cultivars, especially for tomato producers in Taiwan.
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This work was financed by the Ministry of Science and Technology, Taiwan, R.O.C.
Authors’ contributions
C.J.H. and W.S.T. conceived this work. C.J.H. designed and carried out most of the experiments. C.J. H analyzed the data and wrote the manuscript. W.S. T was involved in data analysis and revised the manuscript critically. All authors have approved the final version of manuscript.
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Huang, CJ., Tsai, WS. Occurrence and identification of Stemphylium lycopersici causing Stemphylium leaf spot disease on tomato in Taiwan. Eur J Plant Pathol 148, 35–44 (2017). https://doi.org/10.1007/s10658-016-1066-8
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DOI: https://doi.org/10.1007/s10658-016-1066-8