The occurrence of apricot bacterial canker disease caused by Pseudomonas syringae pv. syringae in Saudi Arabia and factors affecting disease development

Y. Ibrahim


Bacterial canker of apricot (Prunus armeniaca L) has become a serious disease in many countries, including Saudi Arabia, but the causal agent in Saudi Arabia has not yet been sufficiently characterized. In the present study, bacterial strains were isolated from apricot fruits, showing bacterial canker symptoms, grown in Abha region, Saudi Arabia. Based on physiological, biochemical, and genetic characteristics, the pure bacterial cultures were identified as Pseudomonas syringae pv. syringae (Pss). The pathogenicity assays on P. armeniaca cv canino fruits developed canker symptoms that were similar to those observed on apricot fruits in Abha region. The 16S rDNA sequences were 99.9% identical to those of the Pss strains available in GenBank. Analysis of variances indicated that the temperature and inoculum concentration (P < 0.0002) significantly affect disease severity.


Apricot trees, Pseudomonas syringae pv. syringae, bacterial canker, inoculum concentration.

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