First record of Septoria rudbeckiae on Rudbeckia in the United Kingdom.
During the summer of 2016, Rudbeckia fulgida var. sullivantii cv. Goldsturm plants, purchased in the preceding May from a nursery in southeast England, UK, were observed with black leaf spots in outdoor beds at the Royal Horticultural Society (RHS) Garden Wisley. Lower leaves exhibited small black lesions in July, which coalesced as the season progressed leading to complete necrosis of the bottom leaves and spotting on higher leaves. Spots showed no halos and became necrotic only later in the season. Flowering did not appear to be reduced. The causal pathogen was isolated and identified as Septoria rudbeckiae based on morphological, molecular and pathogenicity analyses. This is thought to be the first report of S. rudbeckiae in the UK.