@ARTICLE{TreeBASE2Ref27376, author = {Margot Otto and Yolanda Petersen and Jolanda Roux and Teresa A Coutinho}, title = {Bacterial canker of cherry trees, Prunus avium, in South Africa}, year = {2017}, keywords = {Pseudomonas syringae, MLSA, Prunus, Stone fruit}, doi = {}, url = {http://}, pmid = {}, journal = {European Journal of Plant Pathology}, volume = {}, number = {}, pages = {}, abstract = {In the 1980?s the causal agents of bacterial canker of cherry trees in South Africa was reported to be Pseudomonas syringae pv. syringae and Pseudomonas syringae pv. morsprunorum. Subsequently, no further studies were undertaken on the disease or causal agents. The aim of the current study was to conduct field surveys to determine the current situation pertaining to bacterial canker in the major cherry producing areas of South Africa. Following isolations from infected trees, strains were characterized using biochemical as well as multilocus sequence analyses (MLSA). Pathogencity tests were undertaken with immature cherry fruit as well as three different cherry cultivars. Although symptoms of bacterial canker were present in all areas surveyed, P. syringae isolates was only isolated from three sites in the Western Cape Province. The isolates collected in this study showed a hypersensitive response on bean pods and were pathogenic on immature cherry fruit and cherry trees. The biochemical tests as well as MLSA analyses using four genes (cts, gapA, gyrB and rpoD) showed that all recently collected strains were Pseudomonas syringae pv. syringae. Selected strains induced a hypersensitive response on bean pods and were pathogenic on immature cherry fruit and cherry trees. The current study shows that P. syringae pv. syringae is responsible for bacterial canker in the Western Cape Province, South Africa. } }

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