Have you inspected for bugs?
Sounds like too much water too.
I'd prune off the effected leaves & toss them out.

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Summer Camp '07, July 14th weekend, won't you join us?
summer camp thread 1, 2, 3,4

Thank you, it looks like it might be leaf miner larvae. I will have to see how to treat it. I am using a bagged potting soil in them. I water them so often because it is hot and dry here. I do check before watering so that I only keep them moist and not soggy. I will try to get a clearer picture but the only digital camera I have is on my cell phone and it never takes very clear pics.

Somer,

I know this is a drag because you've already put your tomato in its pot, but in Texas, I reeeelly wouldn't put a tomato in a terra cotta pot EVER. It just dries out way too quickly and it's so much extra work to try and water them so often. Do yourself and your tomato a HUGE favour. Get a 15 gal plastic container, white if at all possible, some Pro-Mix or other soilless mix for containers with water-retaining granules and transplant your tomato into that. You'll be giving your plant such a better start and it will reward you with lots of flowers and tomatoes. You'll still have to deal with some blossom drop because tomatoes don't set flowers well when the temps rise above 90F, but you'll get some. Try to find a spot for it where it gets 12 hours of sunshine, but not on a reflective surface like a driveway that will make the ambient temperature so much more brutal.

Buona fortuna,
Julianna

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If the lower leaves on the tomato plants are all that is affected, just remove them. They are an annual plant anyway and you're not growing them for the leaves. Leaf miner tend to attack young growth and leave a silvery trail under the skin of the leaf. Older leaves which were affected will look curled and misshapen but they will be otherwise OK., The larvae responsible will leave the leaf and then the leaf gets curled up as it ages. Older leaves are susceptible to fungal diseases such as blight and wilts. This could be the yellowing. It's really just a natural part of the aging process with tomatoes. These lower, yellowing leaves should be removed and the plants should not be watered overhead as this helps the spread of these diseases.

SO, flood the soil at ground level, in the morning is best so the area is dry at night and remove affected growth as it starts to yellow. Dispose of these leaves in the rubbish, don't compost them. Mulching will help to retain moisture and also help prevent water splashing up onto the leaves during rain.

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The secret is the soil.