Ramularia leaf spot is sometimes severe on Primula malacoides and P. polyantha in autumn and winter. It is of minor economic importance.

Notes: Ramularia primulae was originally described on Primulaelatior from Germany (neotype in PAD), but it has a worldwidedistribution and has been reported infecting other species of thegenus Primula (Braun 1998). This species is responsible for theRamularia leaf spot disease on Primula spp. It is able to infectboth Primula × pruhonicensis (polyanthus) and P. malacoides(fairy primrose) leaves creating tan or brown leaf spots that maybe accompanied by chlorosis. Conidiophores and conidiadevelop preferentially on the lower surface of lesions formingwhite spore masses under humid conditions. It is a diseasemainly prevalent in the USA, but easily controlled by removinginfected plants from the general population and keeping theseedlings away from older plants to avoid inoculum transfer (Daughtrey et al. 1995).