Answer: There a re a number of foliar diseases that effect tomatoes. Leaf disease include early and late blight, septoria leaf spot and even wilt. Without seeing the damage, it's hard to say which disease you have. I'd consult your local County Extension Office (602-628-5161) to see if they can help. Generally, grow tomatoes in well drained soil, mulch, in Tucson, with any organic materials you can to prevent water (and soil) from splashing on the leaves (soil contains the fungal spores), water only the roots and not the top of the plant and do so in the morning so it dries by evening and prune off and destroy any infected leaves as soon as you see the problem.
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