Yellow Upper Leaves on Tomatoes
I planted tomatoes (various varieties) in April, May and June. The first two groups have grown well, but the upper leaves are turning bright yellow at the stems.
Certified GKH Gardening Expert
Tomato plant leaves turn yellow for many different reasons. Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm