@ARTICLE{TreeBASE2Ref26947, author = {Providence Moyo and Lizel Mostert and Chris Frederik Jakobus Spies and Ulrike Damm and Francois Halleen}, title = {Diversity of Diatrypaceae species associated with dieback of grapevines in South Africa, with the description of Eutypa cremea sp. nov}, year = {2017}, keywords = {Diatrypaceae, Eutypa dieback, dying spurs}, doi = {}, url = {http://}, pmid = {}, journal = {Persoonia}, volume = {}, number = {}, pages = {}, abstract = {Recent studies in grape-growing areas including Australia, California and Spain have revealed an extensive diversity of Diatrypaceae species on grapevines affected by Eutypa dieback. However, little is known regarding the diversity of these species in South African vineyards. The aim of this study was therefore, to identify and characterise Diatrypaceae species associated with dieback symptoms of grapevine in South Africa. Isolates were collected from dying spurs of vineyards aged four- to eight-years-old, grapevine wood showing wedge-shaped necrosis, in cross section, as well as from perithecia on dead wood. The collected isolates were identified based on morphology, culture characteristics and DNA sequence comparisons. Seven Diatrypaceae species were identified on grapevine, namely Cryptovalsa ampelina, Cryptovalsa rabenhorstii, Eutypa consobrina, Eutypa lata, Eutypella citricola, Eutypella microtheca and Eutypa cremea sp. nov. The dying spurs yielded the highest diversity of species when compared with the wedge-shaped necrosis and/or perithecia. Cryptovalsa ampelina was the most dominant species in the dying spurs followed by Eu. citricola whereas E. lata was the dominant species isolated from the wedge-shaped necrosis and perithecia. These results suggest that C. ampelina is a significant cause of spur dieback and E. lata is still an important grapevine canker pathogen in South Africa. However, in some cases, more than one species was isolated from a single symptom which suggests that synergistic interactions may be occurring leading to decline of grapevines. Cryptovalsa rabenhorstii, E. consobrina, Eu. citricola, Eu. microtheca and E. cremea are reported for the first time on grapevine in South Africa. } }

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