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Bacterial canker is a common bacterial disease of stone fruit trees. The causal agents responsible for the disease include several pathovars in and newly described species. Pseudomonad strains were isolated from symptomatic stone fruit trees, namely apricot, peach, and plum trees cultivated in spatially separated orchards in the Western Cape. A polyphasic approach was used to identify and characterize these strains. Using a multilocus sequence typing approach of four housekeeping loci, namely , , , and , the pseudomonad strains were delineated into two phylogenetic groups within : and . These results were further supported by LOPAT diagnostic assays and analysis of clades in the rep-PCR dendrogram. The pseudomonad strains were pathogenic on both apricot and plum seedlings, indicative of a lack of host specificity between strains infecting spp. This is a first report of isolated from plum trees showing symptoms of bacterial canker. is considered to be an opportunistic pathogen that causes foliar diseases of vegetable crops, fruit trees, and aromatic herbs, and thus the isolation of pathogenic from twigs of plum trees showing symptoms of bacterial canker suggests that this bacterial species is a potentially emerging stem canker pathogen of stone fruit trees in South Africa.
This article was published in the following journal.
Name: Plant disease
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