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Powdery mildew on pumpkin/gourd leaves

Complete loss of pumpkin leaves and stems in a susceptible variety without fungicide protection. Photo courtesy of T.A. Zitter, Cornell University, Ithaca, NY

Powdery mildew can occur on both leaf surfaces as well as on petioles and stems.
Photo courtesy of M.T. McGrath, Cornell University, Riverhead, LI, NY


Yellow spots may form on upper leaf surfaces on pumpkin, which is opposite from powdery mildew colonizing the underneath surface.
Photo courtesy of M.T. McGrath, Cornell University, Riverhead, LI, NY

Cleistothecia (sexual spores are within the fruiting bodies) are barely discernible without a hand lens. They develop late in the growing season and serve in fungal survival.
Photo courtesy of M.T. McGrath, Cornell University, Riverhead, LI, NY


Closeup of individual cleistothecia developing on the cucurbit leaf surface.
Photo courtesy of M.T. McGrath, Cornell University, Riverhead, LI, NY

Cartoon depicting the control of powdery mildew with baking soda.
Photo courtesy of O.Ziv, Volcani Center, Bet Dagan, Israel


Field shot of Powdery mildew
Photo courtesy of T.A. Zitter, Cornell University, Ithaca, NY