Grey Mould (Botrytis)
Botrytis or Grey Mould is a very common fungal disease, causing a growth of fuzzy grey mould. Botrytis can affect many plants, especially those grown under glass where conditions are humid and on those plants with softer, more fleshy foliage.
Cultural measures: Avoid over-watering and watering from overhead, ensure good drainage. Avoid misting plants unless necessary. Improve ventilation/ air circulation around those plant and increase plant spacing, dont over plant, space out plants . Remove affected plant parts and any fallen plant debris.
There is no chemical currently on the market registered to control this problem.