Yellow zucchini (summer squash) female flower buds are turning brown and wilting before they can even blossom. They haven't opened, so I can't hand pollinate. Is it a pest that is eating it or is the plant just aborting for some other reason? I've had three fruits ripened already so I know they will open. I've noticed a lot of ants in the male flowers, but I thought they help pollinate. I've had a ton of male flowers blossom already, but they seem to blossom at different types than the female flowers.