Q.why are my tomato plants turning yellow?
I have 5 plants. Two plants have completely turned yellow, one right after the other, so we took them down. Now a third plant is starting to turn. It was planted right next to the others. What could this be? And should I expect the rest of them to die also?
I'm suspecting a disease, since it seems to be moving through your plants, but this article discusses a number of things to be aware of, and possible treatments: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm