Do not overwater the growing media, especially during the first two weeks after propagation by division of the crown and roots. Use healthy plants for propagation. This disease is caused by the fungus Botrytis cinerea. Botrytis blight causes brown lesions on leaves of E. angustifolia . Once the pathogen has invaded the midrib or veins, it can advance rapidly to the petiole and stem, which results in the collapse of the whole leaf.
Lesions expand rapidly.
This results in a moldy gray appearance and rapid disease spread. Infection by botrytis blight causes collapse of the periole. Botrytis blight lesions move up the petioles and into the leaves. Longitudinal lesions appear on the stems. Spores of Botrytis are unicellular, smooth-walled and roughly oval in shape.