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First detection of Diaporthe eucommiae causing leaf black blight disease on Cyclocarya paliurus

Jiang, D., He, H., Peng, X., Tao, Z., Xiao, T., Wang, H.
Forest pathology 2018 v.48 no.5 pp. e12441
Cyclocarya paliurus, Diaporthe, blight, chlorothalonil, conidia, conidiomata, fungi, internal transcribed spacers, iprodione, leaves, pathogenicity, plantations, screening, thiophanate-methyl, vegetation, China
During the vegetation period (March to October) of 2013 and 2014, an outbreak of leaf black blight was observed on Cyclocarya paliurus plants in three plantations in Chengbu County, Hunan Province, China. A Diaporthe species was consistently isolated from the diseased leaflets or rachides. Based on the morphological characteristics of colony appearance, shape of conidia and conidiomata as well as sequences of internal transcribed spacer regions (ITS), the fungus was identified as Diaporthe eucommiae. Pathogenicity test showed that D. eucommiae isolates caused the symptoms originally observed on those of naturally infected plants, and the pathogenic isolates were successfully re‐isolated from inoculated leaflets, thus fulfilling Koch's postulates. This is the first report of D. eucommiae causing leaf black blight on C. paliurus. Laboratory screening indicated that the D. eucommiae isolates were highly sensitive to thiophanate‐methyl, chlorothalonil and iprodione, suggesting that practical use of these three fungicides has high potentials to control the leaf black blight on C. paliurus.