Grey mould is a type of fungus that affects plants and causes bacterial and fungal infections. It is also known as Botrytis cinerea, a common fungal disease that can be found in organic matter, soil, and plants. There are several other terms used for grey mould such as Botrytis rot, Botrytis blight, and grey blight. Other synonyms may include Botryosphaeria cinerea, apple rot, flower blight, and noble rot. This type of mould can cause considerable damage to plants, particularly in humid and moist conditions, making it essential for gardeners and farmers to maintain good hygiene practices to prevent the spread of the disease.