Bacterial inflorescence rot of grapevine caused by Pseudomonas syringae pv. syringae in Iran

Standard pathological and microbiological methods identified Pseudomonas syringae pv.syringae (Pss) as the causal agent of bacterial inflorescence rot of grapevines (Vitis vinifera)in the Sistan region, Iran in 2010. Pss strains from shrivelled berries and necroticinflorescences of diseased grapevines were used to inoculate leaves and inflorescences ofpotted grapevines. Pss caused disease symptoms similar to those experienced in the field,including angular leaf lesions, longitudinal lesions in shoot tissues and rotting ofinflorescences from before flowering until shortly after fruit set. Bacterial inflorescence rot ofgrapevine caused by Pseudomonas syringae pv. syringae has been reported only from theAustralia, and this is the first report of this disease in Iran.

Keywords:

Vitis vinifera , xylem , Pseudomonas syringae