Are they in a container or in the ground? If in a container how big? How many hours of sun does it get and besides all the rain you have been getting do you water on top of that? If so, how often and about how much? Did you check for any Hornworms? They are hard to spot so look good. They can cause damage to your tomatos like you are describing. It can be alot of other stuff also... Get back to me and we can continue this conversation
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For those who believe no explanation is necessary... for those who do not none will suffice.... "Joe Dunninger"