Botrytis (Grey Mould) is a plant disease often found on indoor cyclamen and outdoor flowers such as dahlia and chrysanthemum kept in humid conditions.
A grey fluffy mould found on leaves, petals and the base of stalks.
Treatment and control
General tips: Pick off affected part of the plant and reduce humidity by increasing space between plants and air movement. Burn plants that are severely affected. Avoid over-feeding with a high nitrogen fertiliser as this encourages soft lush growth that is more susceptible to attack. No fungicide treatments are available to amateur gardeners.