Female squash flowers dying BEFORE opening
First, I want to thank everyone on this forum that has been helping me out with every little problem I've had! You've all been very helpful. As a first time gardener, your advice (and that which I could find in searches) has been amazingly accurate.
I'm having a problem with my squash plant. My female flowers and fruit are now dying and dropping off BEFORE opening. I have a butternut squash vine (two, actually) with 4 growing squashes between the two of them. I hand-pollinated these in the early mornings and they took. Since then, though, all other female flowers are dying off. Is there anything I can do to get more of them to flower and grow? I'd like to get more squash, but this is a winter squash vine and it'll take a while for the 4 growing fruit to mature and ripen.
The picture I'm attaching has an early female flower at the top left. The other three are in various stages of dying off. I check early in the morning and frequently look in on my garden during the day as well. None of them even opened.
Thanks for looking.
Here is a link that might be useful: