MY squash blooms are wilting before they bloom. I am trying to deny that idea of my head saying too much poop. could it be? Say it isn't so. I did find a slug....is he the culprit?
Too much poop would cause nitrogen issues and I think it would probably be evident in the leaves. On most stuff nitrogen burn shows up as yellowing starting inside the leaf veins and spreading outwards easy to cure though just lots of water. Other than the pests (which is a good possibility) Squash blooms really don't stick around long. Maybe a day or two at best. Is it possible they opened up while you were gone one day? As soon as they are polinated they close up and start to wilt. Check the immature fruit behind the female flowers for rot/signs of insect damage
For as long as i've grown zucchini i've always had problems with the vine borer, actually last year i didn't have that many problems because of a few methods i used. I covered the stem part of the vines with aluminum foil which protects it from the borer to enter and it actually scares the adult borer fly when they try to lay their eggs on the leaves, the foil kind of discourages the fly from laying. I've also just bought a vegetable pest spray for vine borers and they seemed to go away. Squash vine borers only lay their eggs in the early summer by mid summer they usually stop laying their eggs so if you could just protect them from that time you should be ok.