Abstract A description is provided for Cercospora olivascens , which sometimes causes severe damage to Aristolochia leaves. Some information on its interactions and habitats, economic impacts, intraspecific variation, dispersal and transmission and conservation status is given, along with its geographical distribution (Morocco, Argentina, China (Anhui, Zhejiang), Republic of Georgia, India (Uttar Pradesh), Korea Republic, Turkey, Belarus, Bulgaria, France, Germany, Hungary, Italy, Montenegro, Portugal, Romania, Russia, Slovakia, Spain and Ukraine) and hosts ( Aristolochia clematitis, A. contorta, A. debilis, A. fimbriata, A. iberica, A. indica, A. longa, A. manshuriensis, A. pallida and Aristolochia sp.).