Every time I water my tomato plants in a raised bed one of the plant stalks will be chewed in half at ground level. There's little ant hills that come up and the roots and all will be gone. I even replanted & same thing keeps happening. I cannot find anyone this has happened to before. Any help?

Well, ants don't eat your plants. But I would try Spinosad which is an organic spray that will kill anything that chews o n your plants. It will not harm bees or beneficials as they don't chew on the plants either. It is safe for veg and herbs. Don't spray on any herbs that you want butterflies to lay eggs on such as dill, fennel, rue etc...