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My tomato plant has yellow leaves

by Stephanie Chase
(Peoria, IL, USA)

Leaves with yellow and brown

Leaves with yellow and brown

This is my first garden. I planted both cucumbers and Brandywine tomatoes. The cucumbers have already started dying. The leaves turned yellow then brown and died. Now my tomatoes are having the same issue. The leaves at the base of the plant are yellow and the edges are turning brown and curling. The plant is producing a lot of fruit still and they look good though still green. The stem also turns yellow once the leaves turn brown. I have examined the leaves carefully but see no dark spots or bug circles. I thought I was over-watering so I lessened my watering. That did not help so I then watered more. Nothing. It has been very, very hot. Temperatures in the upper 90s to 100s. Humidity has also been very high. The plants are in direct sunlight all day til about 7 PM then shade. I have attached pictures of two of the branches and a picture of the tomato plant.

Q. Welcome to the world of gardening. We're glad you're part of our growing family!

It has been a tough season for many gardeners so you're not alone. Congrats on getting much fruit. Also, your plants look strong (apart from the yellowed leaves, of course) so you're doing something right!

There are several reasons why your tomato plant's leave could be turning yellow, then brown, then falling off. You've been smart to check things carefully, ruling out over-watering, under-watering, and pests, but there are still a few possibilities:

  • Heat. Let's face it, those temperatures are brutal. Sometimes it's just too hot for too long. That kind of weather is stressful for tomato plants. Tomatoes flourish when temperatures are in the mid-80s. Right now, they're just trying to survive. You can't change the weather. But it's helpful to know that it may not be something you're doing or not doing.
  • Sun. Can you give them any shade in midday? You can use shade cloth in different weights and sizes or even try a shade cloth kit.
  • Blight. Plants may still be victims of Septoria leaf spot. This disease is often confused with early blight. But Septoria doesn't show itself with concentric rings that are characteristic to early blight. You can even compare Septoria with late blight. Your leaves look brownish/grayish, which is consistent with late blight. Either way, the treatment is the same: treat organically with a biofungicide like Serenade or with another fungicide like Daconil or Mancozeb.
  • Wilt. Both verticillium wilt and fusarium wilt exhibit yellowed leaves. Fusarium often just affects one side of the plant. Verticillium encircles the plant.

Good luck and happy gardening!
Your friends at Tomato Dirt

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Aug 07, 2015
Thanks for asking. NEW
by: Chris Federick

Hello Stephanie! Feeling sorry for your plants! I should not happen; I think it is due to the direct expose of sunlight for the whole day. The answer described here is quite satisfactory. You need to give them little shade for some time. Apart from it you need to apply some good quality of organic plant foods that does not have any chemical composition. You may prefer organic plant fertilizer of GS Plant Foods Company. It would surely helpful in increasing the fertility of your soil and help yielding more. Thank you.

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May 16, 2015
Reasons Why Tomato Plants Leaves Turn Yellow NEW
by: raysipple

If you only see a few yellow tomato leaves toward the bottom of the plant, you have nothing to worry about. The leaves of tomato plant turning yellow at the bottom of the plant means these leaves probably aren’t getting the nutrients from the soil and aren’t getting sunshine. This especially happens when the plant is more mature and bearing fruit.

Tomato plants leaves turn yellow for a variety of reasons, some of which aren’t as simple as the plant maturing. Regardless of the issue, whenever there are yellow leaves on tomato plants, it warrants a thorough check as to what the problem could be. You can read more, check this link right here now.

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