What's up with my pumpkins?

So We have early pumpkins. Three to be exact, but I am not sure what's going on with them. The leaves have white stuff on them, and some leaves are turning brown and dying. It's gets enough water cause the other plants in the garden are just fine. So what's up with my pumpkins? If it's fungus and my pumpkins are dying should I pull the whole plant so the other plants don't get affected? I really don't want my other plants to die, but if it will go away with a little help, I want to do that instead of pull the whole plant. Any suggestions? Take a look at the pictures.