Plant Protect. Sci., X:X | DOI: 10.17221/75/2025-PPS

Bacterial etiology of leaf galls of oleander (Nerium oleander L.) in PolandShort Communication

Monika Kałużna ORCID...1, Adam T. Wojdyła ORCID...1
1 The National Institute of Horticultural Research, Skierniewice, Poland


 In the spring of 2022, small, regular, brownish spots of parenchymatous galls on leaves of oleander plants were observed on Nerium oleander L. cv. Emile Sahut. Bacterial isolates were obtained from diseased samples. The 16S rRNA sequence analysis and concatenated data set of housekeeping genes gltA, gyrB, rpoB, and rpoD showed that the obtained isolates are most closely related to Pseudomonas savastanoi pv. nerii. Pathogenicity tests on N. oleander L. (cv. Emile Sahut) plants confirmed the pathogenicity of the isolates. The study constitutes the first report of bacterial leaf galls caused by P. savastanoi pv. nerii in Poland.

Keywords: oleander knot; pathogenicity; phylogenetic analysis; Pseudomonas savastanoi pv. nerii; gltA, gyrB, rpoB and rpoD

Received: May 14, 2025; Revised: February 12, 2026; Accepted: February 12, 2026; Prepublished online: June 8, 2026 

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