peronospora dianthicola peronospora dianthicola peronospora dianthicola is a plant pathogen. it causes downy mildew on leaves of carnation (dianthus caryophyllus). the disease is of minor importance, whether in commercial production or gardens. if necessary, it can be controlled by foliar sprays of fungicides. peronospora dianthicola scientific classification kingdom: chromista phylum: oomycota order: peronosporales family: peronosporaceae genus: peronospora species: p. dianthicola binomial name peronospora dianthicolabarthelet, (1953)