Yellow leaves and black spots on leaves of tomatoes

What is causing the leaves of my tomato plants to turn yellow with black spots and then fall off. They were very healthy to begin with and then the condition above began. I dusted with 10% sevin thinking it was an insect causing the problem but this did not help. Could it be a fungus due to all the rain we have had this summer? Help! I was looking forward to wonderful tomatoes. Thank you for any advice which may help.
Submitted by BHGPhotoContest

"Sounds like fusarium wilt, a fungal disease that lives in the soil. It infects only tomatoes and is spread around by infected soil, mulch, tools, and plants.
There's no chemical solution. The best way to prevent it is to remove and destroy infected plants right away (don't compost them. get rid of them completely.). Don't plant tomatoes in the same place. A three-year rotation plan is best.
The only sure way to avoid it, though, is to plant resistant varieties. Those are ones with an 'F' designation after its name in seed catalogs. (Many plants will have VF or VFN after the name. The F is fusarium wilt.)"


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