First report of Cercospora Rumicis in Australia.

A leaf spot disease was observed on red veined sorrel (Rumex sanguineus) growing in a commercial greenhouse in northern NSW, Australia, in July 2021. Cercospora rumicis was found in association with the leaf spot and was identified morphologically and by sequencing two gene regions, histone-3 (HIS) and calmodulin (CAL). Koch's postulates were fulfilled through pathogenicity tests, including the inoculation of potted plants and a detached leaf assay. This is the first report of Cercospora rumicis in Australia. [ABSTRACT FROM AUTHOR]