First report of Pseudomonas savastanoi causing bacterial leaf spot of Mandevilla sanderi in Slovenia.
Foliar necrotic spots with narrow chlorotic halos were observed on different cultivars of Brazilian Jasmine (Mandevilla sanderi) during spring 2010 in several commercial greenhouses in Slovenia. Up to 70% were symptomatic and were unmarketable. No galls were observed on the stems of symptomatic plants. Circular, flat, granulated colonies with entire margins were isolated from symptomatic leaves of two plants from different greenhouses on King's B medium. Based on biochemical, molecular (PCR assay) and pathogenicity tests, the causal agent was identified as P. savastanoi. This is thought to be the first report of P. savastanoi on M. sanderi plants in greenhouse production in Slovenia. The galls caused by P. savastanoi have previously been reported from the United States and Germany. This report broadens the geographical area where P. savastanoi, causing both galls on stems and necrotic spots on leaves, can be found in commercial production of Mandevilla spp.