Ramularia rubella

{{Short description|Species of fungus}}

{{Speciesbox

| image = Fungi-Ramularia-rubella-201304280006.JPG

| image_alt = Leaf with several yellow-brown spots embedded within a larger reddish-purple spot

| image_caption = Ramularia rubella on a Rumex leaf

| genus = Ramularia

| species = rubella

| authority = (Bonord.) Nannf.

}}

Ramularia rubella is a plant pathogen in Ascomycota that infects Rumex species. Infection produces reddish spots on leaves. The red color is caused by the production of rubellin, a photodynamic anthraquinone-derived phytotoxin. R. rubella was originally described from Rumex aquaticus in Germany; it has a wide geographic range on Rumex species. It is being investigated as a biological control agent of Rumex obtusifolius. {{cite journal |last1= Videira |first1= S.I.R. |last2= Gronenewald |first2= J.Z. |last3= Braun |first3= U. |last4= Shin |first4= H.D. |last5= Crous |first5= P.W. |title=All that glitters is not Ramularia |journal=Studies in Mycology |volume=83 |pages=49-163}}