New to growing pumpkins and squash. Things were looking very good then suddenly not. Leaves on my Hubbard squash look sad, kind of wilty, wet spots, some dry and yellow curled edges. Some if my pumpkin plants also look wilted. I am in Michigan, the seeds were planted over mother's day weekend, we have had avg 70-80 degree days, mostly full sun, recent rain storms and couple cool 50-60 degree nights. Plants are in 15gal bags, with peet moss, garden soil, fertilizer. Watered in evenings if no rain. Please help!