Phyllosticta Leaf Spot -- Phyllosticta draconis
Host: Dracaena, peperomia
Symptoms: On dracaena, this disease causes yellow irregularly shaped areas to form on both surfaces of older leaves. The spots eventually turn brown with a purple margin, and pycnidia form in the lesions. Older lesions can form bright yellow halos. On peperomia, the spots begin as black specks on leaves of any age. The lesions can then enlarge to a diameter of 1 cm while rings of light and dark tissue form.
Conditions Favoring Disease: This disease occurs in areas with heavy overhead watering.
How Pathogen Survives/Disperses: The fungus overwinters in infected leaves and is spread by water splash.
Photo and write up provided by Syngenta Professional Products