Two novel species and a new host record of (Pleosporales, Pleosporaceae) from sunflower (Compositae) in Myanmar.

Sunflower ( L.) is a widely cultivated, fast-growing crop known for its seeds and oil, with substantial ecological and economic importance globally. However, it faces challenges from leaf diseases caused by species, which threaten its yield. Three small-spored species were isolated from leaf spot and blight symptoms on sunflower in Myanmar. All the species were determined based on morphological characterization and a multi-locus phylogenetic assessment of seven genes, including the internal transcribed spacer of rDNA region (ITS), glyceraldehyde-3-phosphate dehydrogenase (), RNA polymerase second largest subunit (RPB2), translation elongation factor 1-α (), major allergen gene (), endopolygalacturonase gene (), and an anonymous gene region (OPA10-2). The results introduced two new species, and , and a known species of , firstly reported from sunflower.