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Avatar for KateRussell
May 19, 2018 7:27 AM CST

According to the UC IPM Note on powdery mildew, humidity is not a factor in the development of powdery mildew. In fact, the presence of moisture in spring inhibits this fungal disease.

http://ipm.ucanr.edu/QT/powder...
http://www.thedailygarden.us/g...
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