A disease that is common to roses is black spot which is a fungal disease.
Black spot disease which is a fungal disease causes dark spots on the leaves of roses.
Other common diseases on roses is rose dust, Botrytis blight and powdery mildew.
Black spot on the roses causes dark spots on the leaves of roses and often with a yellow halo, which leads to premature leaf drop.
Botrytis Blight on roses affects the flower buds and petals of the roses and causes them to turn brown and decay and prevents them from opening.
Powdery Mildew on roses is a fungal disease which appears as a white, powdery growth on leaves and stems and cause them to become stunted or distorted.
Rose rust on roses appears as orange pustules on the underside of the rose leaves, with corresponding yellow spots on the upper surface.
It can also cause leaf drop and if severe it can even damage the stems of the roses.
If the rose bush has spotted, withering flower petals and rotting buds it's a common sign of gray mold on the roses.
Infected flowers and buds of roses may turn completely brown in color and gray, fuzzy mold may even be invisible on infected flowers, leaves and or stems of the roses.
The disease is caused by the fungal pathogen Botrytis cinerea.