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Because powdery mildew colonies typically are larger with denser sporulation on lower leaf surfaces than on upper surfaces, control on lower surfaces (left section of this leaf which is folded over) is very important.

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Link to the News Article "Guidelines  for  managing  cucurbit  powdery mildew  with  fungicides  in  2005"

Link to the Factsheet on Powdery Mildew of Cucurbits

Link to Photo Gallery of Powdery Mildew of Cucurbits