Maybe blight. How big is that pot, it looks tiny in the pic.

THE photo is not in focus enough for me to see what's within the yellow halos but the spots are small, look to be on the dark side rather than brown, so unless you can get a clearer picture it looks like either Bacterial Speck or Bacterial Spot to me right now.

Just noting that the word blight is used by many just to indicate a sick tomato plant but based on the size and color and shape of the spots themselves, and whether there are or are not yellow halos, the two other major foliage diseases are fungal and are Early Blight ( A.solani) and Septoria Leaf Spot.

There are other diseases that have the word blight in the name, such as Southern Blight and Late Blight ( P, infestans), but those are systemic diseases, not foliage diseases.

Hope that helps.

Carolyn

http://sphotos.xx.fbcdn.net/hphotos-ash4/485678_10101063513966341_6018816_59702963_806728395_n.jpg

That is a better shot.

It's a small pot... raised from seeds was about ready to transplant into the ground when I noticed the spots forming.

I've taken careful steps to only water the roots and prevent splashing onto the leaves to stop diseased. I thought it might be caused by aphids but I have plenty of predator insects in my garden (lady bugs, wasps, bees etc.)

No, not aphids and foliage diseases are spread via wind and rain, for all new foliage diseases, and only if you had the same problem in a previous year could there be splashback infection with spores/bacteria that had fallen to the ground.

With your new picture I don't see what I saw before. I now see lots of leaves with dark edges and that can be due to either fertilizer burn, too much fertilizer, or too much water.

What do you think in terms of fertilizer used as well as too much water?

What about the rest of your tomato plants? How are they doing? And did you raise them from seed or purchase plants?

Carolyn

The rest of them have similar leaves with dark edges. Most were purchased plants (Bonnie is the maker)

Fertilizer : Tomato / Vegetable food once per month. (made specifically for tomato's)

Water : Once per day right now as it's been 75+ each day. Might be excessive even in dry conditions.

Thanks