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Gray mold is one of the most common and serious diseases wherever strawberries are grown.
It is caused by the fungus, Botrytis cinerea . The disease thrives during prolonged rainy and cloudy periods just before or during harvest, and on dense, lush, foliar growth. Symptoms Young blossoms are very susceptible to infection. Light gray masses of dusty spores soon appear and are easily dislodged and carried by air currents to other blossoms. Such infections are most common in well protected areas of the plant, where the humidity is high and air movement is poor.