Tomatoes are fairly easy to grow and care for. However, they are sensitive and need a specific environment in which to grow. Yellow leaves usually indicate that something is wrong in their environment.
Leaves may turn yellow from lack of sunlight. Leaves at the bottom of the plant commonly turn yellow because the upper leaves are blocking the light.
Tomato plants need nitrogen. Yellow leaves can be due to lack of nitrogen in the soil. Plant fertiliser will easily solve this problem.
Tomatoes must be watered constantly to keep the soil moist. Too little water can damage the plant and cause the leaves to turn yellow or brown. Additional watering may remedy the problem.
Pests, such as caterpillars or worms, like to eat tomato plant leaves. Leaves may turn yellow from the damage caused by the insects.
Bacteria or Fungus
Tomatoes are vulnerable to bacterial and fugal infections. These can damage the leaves and fruit. Treatments are available to cure the infection, but may kill the plant if too much is applied.
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