Tomato plants - all doing well but one!?

Question

I have five tomato plants and all of them are doing really well except one -- they were all growing well and vigorously, and all seemed healthy. When they got to about four feet tall, they started producing flowers and then green fruit. About that time, say, last week, one of them started to look sun-stressed and wilty. Then it started turning yellow. All the others look great, and the sick one is right in the middle. It's been at least a week and it's still going downhill. I can't imagine it could be over or underwatered, since the others are fine. Any ideas?

Answer 1

A pest or disease of some sort.  If it were me, I'd cut it to the ground and get rid of it.

Answer 2

maybe its been infected by insects

Answer 3

If you have one plant in the middle of all the rest that is turning yellow and wilting it probably has a fungal or virus disease.  While a fungus is treatable and a virus isn't, one plant isn't worth infecting all the rest.  Pull it up and get it out of there.  Clean up any old plant debris in the area as well.

Answer 4

It could possibly be the drainage of the roots of that one plant. Try slopping the soil or trying to possibly watering it less. Hope that helps!

Answer 5

It could be a phosphorous deficiency. That happens a lot when they start turning all yellow and get kinda crummy. Get some tomato food or basic fertilizer (12-12-12 works good for me) and give it to the plant once a week. Make sure you stop when it starts ripening though... give it just plain water for a couple weeks before you pick the fruit.

Good luck