From dust to dust

From dust to dust?

My once-magnificent squash has caught a nasty case of the mildew overnight.

I’ve given it a severe haircut and am willing the little fruits to grow as quickly as they can before the whole thing crumbles to dust, and fretting and despairing and wondering if there’s any hope at all or whether it will spread and spread until all that is green and good in this world is gone.

Can anyone confirm or expand on my diagnosis,  suggest any mildew magic that doesn’t involve nasty chemicals, or just tell me that there’s still some hope while green leaves grow?