First report of bacterial blight of Strelitzia augusta caused by Pseudomonas syringae pv. lachrymans.
During February 2004, a new blight disease was noticed on potted Strelitzia augusta [Strelitzia alba] at different ages (6 months to 4 years) in several commercial nurseries of eastern Sicily, Italy. Field inspections revealed disease incidences as high as 40%. Initial symptoms were small, water-soaked leaf spots that expanded throughout the veins in dark brown streaks. Stem cross-sections revealed browning of the vascular tissues, which might involve the entire stem. In some cases, the necrosis extended to the apical bud, causing death of the plant. Results of pathogenicity test and the inability of the isolated Pseudomonas syringae strain to utilize homoserine identified the strain as P. syringae pv. lachrymans. This is thought to be the first report of P. syringae pv. lachrymans on S. augusta.