Thanks much for the info. I've been really busy lately. I read your answer and was able to spray the plants, but forgot to get back here and reply.That's good old powdery mildew. You could spray and that helps a bit. Mine start doing that towards the end of the season. I just let it be until my harvest is over and then I just pull the vine out.
Mary
These are mini pumpkins. There are lots of pumpkins and lots more blooms. Maybe I caught it in time so the blooms will produce more pumpkins.@freedhardwoods, are there pumpkins on the vines? Maybe they will go ahead and finish up.
Do you think it would help to remove the diseased leaves, and maybe provide some shade so the pumpkins (if any) don't get sunburned?