All species of roses (Hulthemia, Hesperrhodos, Platyrhodon and Rosa) are affected by black spot disease. The disease is found everywhere roses are planted, typically in epidemic proportions. The water-borne dispersal methods allow it to infect a plethora of plants every growing season and increase the overall incidence of disease.
Black spot disease affects all species of roses (Hulthemia, Hesperrhodos, Platyrhodon, and Rosa). This condition is prevalent wherever roses are grown, often in large quantities. The water-spread transmission methods allow it to infect numerous plants annually and increase the overall incidence of illness.