Term: Powdery Mildew
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This fungal disease affects many types of plants and can occur in cool, humid climates, hot, dry climates, and all in between. Late summer, with hot days and cool nights, is a particularly popular time for powdery mildew to spread. Generally easy to identify, the primary symptom of an infection is grey or white spots on leaves and other plant parts. Remove areas of the plant that are infected to reduce spread. Increasing space between plants will allow more air circulation and help prevent this problem. Foliar sprays of diluted milk or bicarbonate have also proven to be effective.