The fungus will survive the winter in these mummy-berries which have fallen to the ground. In the spring, they will produce mushroom-like fruiting bodies , which will make the spores for that years' infections. In small plantings, the mummies can be raked up and burned. Applying a urea fertilizer to drier parts of the field at the time of bud-break can help speed the destruction of the mummies. Urea should not be applied to wet areas of the field because of the danger of fertilizer burn.
Resistant varieties are available.
See current recommendations for chemical control measures. Botrytis Blight or Gray Mold is caused by the fungus Botrytis cinerea . This fungus is literally everywhere, and affects a broad range of plants. On blueberry, it usually affects blossoms and ripening fruit, although it can cause a stem blight as well. It was first reported on blueberry in New Jersey in 1924.