Hard to tell your situation without a bit more info. Pics are a great help too. First off, curling leaves aren't much of a problem, especially lower leaves. Leaves in contact with the ground, then curling and developing spots may be a concern. So, make sure there are no leaves in the dirt; if there are then either trim them off the plant or support them somehow away from the soil. Lower leaves generally are lost by the end of a growing season anyway. Don't worry about cutting those bottom leaves off, it won't hurt the plant in any way. Hope all this helps.

Whiteflies and aphids can cause curling leaves. If you shake the leaves and little white things fly up, it's whiteflies. If the undersides of the leaves have little insects on them, it's aphids. Insecticidal soap can help both problems.

Spots are usually from fungal diseases. Early Blight and Septoria are most likely in our area. Early blight shows concentric rings with a yellow halo. Septoria has a grey center and lacks the yellow halo. There are (unfortunately) many other fungal and viral diseases that cause spots.

Keep in mind that the curling leaves and the spots may be caused by separate problems.

I wouldn't worry that much about the curled leaves. They curkl when it's too hot, too cool, too wet and too dry and when there's a heavy fruit burden. If they curl over into a tube like structure, then look for aphids.

Spots on the leaves in your area suggest one or more of the four most common foliage diseases, Early Blight ( A.solani) and Septoria Leaf Spot being fungal and Bacterial Speck and Bacterial Spot being bacterial/

There is no tomato spray that is effective against both fungal and bacterial foliage diseases. The fungal ones do progress faster and I might suggest you consider using Ortho Garden Disease Control for the fungal ones.

But perhaps it would be best for you to go to the Tomato Pest and Disease Forum, link at the top of this page and find the thread titled Problem Solver #2 and look at the posts for links to sites that post good pictures. One of the best is TAMU.

Then see if you can match up what you see with a picture.

Carolyn