Sudden wilting when plant is loaded with fruits. Leave in place for a month. Tomato hornworms eat a lot quickly. Pick off by hand. Raccoons and squirrels chew.
Pheasants peck the fruits.
There s just no substitute for hot sun. Mulch plants, keep even soil moisture through growing season. Called Blossom End Rot. Mulch plants, keep even soil moisture through growing season. Mostly a problem in Zones 9 and 10.