Why are my tomato plants dying

I have 10 tomato plants. 8 look healthy. 1 has died. 1 is beginning to curl up (it will die as well). At first all the plants were very healthy looking. Big stalks, dark green leaves, no bugs or worms. The one that died first the leaves begin to curl then the whole plant died. The one that is now dying still looks good but the bottom leaves are beginning to curl. I know it is going to die because it is doing the same thing the other one done. Im thinking there must be something in the dirt attacking the roots. What can I do to prevent the rest from dying?
  5 answers
  • Abedabun Dawn Abedabun Dawn on May 12, 2017
    Thank you! It looks like I need to replace my dirt. But I have a lot more research to do first.

  • Kathy Kathy on May 13, 2017
    A picture would help tremendously!

  • HisRib HisRib on May 13, 2017
    We had the exact same problem years ago with 28 tomato plants and a half dozen Bell Pepper plants. Leaves turned yellow, then dried up & fell off. We had no tomatoes or peppers that year and now have a new garden space for those two vegetables. We did take soil samples to a nearby lab & soil was fine. The problem was "Juglone" toxin from a nearby Black Walnut tree.
    You can Google it and find a list of plants that will --and will not-- grow near a walnut tree. You can take some leaves or part of the plant to a nursery; our local one has books on plant diseases (and pesrs) and should be able to help you. Good luck!

  • Abedabun Dawn Abedabun Dawn on May 13, 2017
    omg! That is my problem!!! There is a black walnut tree about 50 foot away. Thank you! I will just try planting at the other end of the garden. I appreciate you!