Why are my tomato plants turning yellow?

Answer

Tomato plants turn yellow for several reasons, including insect infestation, viral infections, too little water and too much sun. Most of these problems affect only the plant's leaves, but the fruit can also shows signs of distress.

The psyllid is a common insect that affects tomatoes; it leaves behind distorted stem growth and yellow leaves that later turn purple. Aphids and whiteflies also cause tomato leaves to yellow, although the damage to the plant is usually minimal. Fusarium wilt is the result of a fungus that causes the leaves to discolor and turn downward. The curly top virus is spread by the beet leafhopper, and it turns the leaves yellow and stunts the plant's growth.

Q&A Related to "Why are my tomato plants turning yellow?"
Healthy tomato plants have deep-green leaves. Some common tomato pests that can turn leaves yellow are psyllids, flea beetles, tomato hornworms, whiteflies and aphids. Determine if
http://www.ehow.com/facts_5572047_tomato-plants-le...
Not enough Magnesium in your soil. Magnesium ions are essential in chlorophyll, the 'pigment' that gives leaves their green coloration and thus also their light absorbing properties
http://wiki.answers.com/Q/Why_do_tomato_plant_leav...
Cut off yellow leaves and throw in garbage. It is blight, you can't stop blight tomatoes always get it. You should plant tomatoes in different spots and never repeat for 3 years.
http://answers.yahoo.com/question/index?qid=201308...
you dont say if the leaves are going yellow at the botom or all of the leaves? if it is the bottom leaves only then there is not a problem, as the plant grows bigger the newer leaves
http://uk.answers.yahoo.com/question/index?qid=200...
1 Additional Answer
Ask.com Answer for: why are my tomatoe plants turning yellow
Why Are My Tomato Plants' Leaves Turning Yellow?
Though tomatoes (Lycopersicon esculentum) are grown for their fruit, not their foliage, yellowing leaves should cause concern. Usually grown as annuals, tomato plants are susceptible to many diseases. Some harm only leaves, but others threaten the fruit.... More »
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Source: www.ehow.com
Explore this Topic
There are numerous reasons that would make a tomato plant turn yellow, among them; overwatering, lack of the necessary nutrients, presence of pests and plant diseases ...
The leaves on your tomato plants may be turning yellow due to insufficient nutrients from the soil, insufficient sunshine or due to a general lack of Nitrogen ...
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