Powdery mildew (caused by the fungus named Podosphaera xanthii) was consistently among the most prevalent diseases of watermelon in a survey of foliar diseases done in 2015 and 2016, second only to gummy stem blight.1 As no resistant cultivars of watermelon are available, specific fungicides are necessary to manage the disease. Symptoms and Signs The … Continue reading Powdery Mildew on Watermelon