Corynespora Leaf Spot -- Corynespora cassiicola
Host: Aeschynanthus, aphelandra, Coleus spp., ficus, African violet
Symptoms: Corynespora leaf spot appears on most plants as tiny, sunken, brownish lesions that enlarge and darken with age. The leaf spots are dark brown to black in color and appear wet on aphelandra, while on ficus, the spots are small to large and reddish in color and appear on the most recently mature leaves. Leaf abscission may occur when leaf spots expand between the veins.
Conditions Favoring Disease: This disease typically is favored by conditions with excessive water, including condensation on the plant overnight.
How Pathogen Survives/Disperses: Spread via rain/irrigation splash.
Photo and write up provided by Syngenta Professional Products