Pumpkin fungus or mold?

My pumpkin leaves are turning white or have some kind of white powder on the leaves, some are completely white and some are yellow and dead. What is this and how do i fix it.Pumpkin fungus or mold?
There is a fungus that attacks pumpkins and squash and sounds a lot like this - you can get a fungicide for it at your local hardware / lawn / garden center.





But if your pumpkins are finished - if they are orange and the stems pop off easily, this is just the natural end of the pumpkin plants life cycle.

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