Tomato plant leaves turning yellow from stem out to tip

Question

Leaves bright yellow at stems and green on outside tips. Some are curling and getting brown spots.

Answer 1

It sounds like early blight. This article will have more information:
https://www.gardeningknowhow.com/edible/vegetables/tomato/early-blight-alternaria-tomato-leaf-spots-yellow-leaves.htm

If you do not feel this is the problem, here are some other reasons for yellowing leaves in tomatoes: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm