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Grey mould (Botrytis cinerea) on strawberries (Fragaria sp.). Grey mould is a fungal disease, which is also known as 'Botrytis bunch rot'. It can be caused by excessive moisture. To prevent this from occuring, the strawberry plants are planted using straw to elevate them above the soil. (KEYSTONE/SCIENCE PHOTO LIBRARY/DAVID ROACH/SCIENCE PHOTO LIBRARY)