several of my tomato plants have very curly leaves and they look like they...
Your photo is so out of focus that we can't tell what the problem may be. We'd invite you to send us another photo.
Tomatoes are very sensitive to herbicide damage, especially 2-4D weed killer. Herbicides can be wafted over to a plant on a slight breeze. Or, oftentime the nozzle of a sprayer has a very fine spray that goes beyond the spray that you see with the naked eye and you can inadvertantly end up spraying weedkiller on your desirable plants. If the contact is minor, the plants will recover. If the plants absorbed too much herbicide, they will die.
For more information on what makes tomato leaves curl, see our diagnostic chart;