May have a concentric ring pattern. Pseudomonas cichorii Maintain low relative humidity. Avoid overhead watering. Botrytis Blight Petioles have long brown spots. Leaves yellow and die.
Petals have tan spots.
Stems at soil level are killed. Infected tissues become covered with gray fungal growth. Botrytis cinerea Space plants to insure good air circulation. Maintain low humidity. Avoid watering late in the day.