Every year about 1/3 of my tomatoes get diseased and die. It appears to be more than one symptom and can kill one plant and leave another of the same variety untouched. The plants uniformly grow well early in the season. Then in late June or early July, symptoms start to appear. Within a few weeks some plants are so sick, I just pull them out. 
Because I don’t use any chemicals, fungicides, or pesticides in my garden, my solution is to plant at least twice as many tomato plants as we need. I did try an supposedly organic sulfur spray one year, but had no beneficial results.
I would be very interested if anyone recognizes the symptoms in the pictures at this link. Thanks!
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Some of those pictures do look like blight.
Yes you right that tomatoes is easily get disease because I plan it in my house yard and have the same problem. But my tomatoes usually get attack by kind of white flys in the leaf and branch.
Will, I feel your pain, brother. It hurts to loose a tomato plant. I’m wondering what variety or varieties that you plant? I usually get varying amounts of brown leaves as the season progresses but I haven’t lost a plant yet. I did have a problem with blossom end rot two years ago until I figured out I needed to water more frequently. And last year I tried an heirloom (Purple Cherokee) but had the majority of its tomatoes rot or go bad before they ripened, so I gave up on heirlooms (my friend has had success though). So what varieties are you growing, and do they all suffer this fate? I’ve also heard it’s good to rotate where you plant them year to year as the soil can get contaminated with a tomato virus. ~ Steve (a tomato lover indeed!)
PS. I saw this post on your “random posts” section. I’ll click on anything with the word tomato in the title!
Were in Texas,SE, & can plant early. We planted tomatoes last month in April (this is May 3) & I have notice some of my tomatoes have black spots on the bottom. Also, some of my leaves are turning yellow at the bottom. Solution? Jule Koch
Hi Jule – Can you put some photos of them online at a site like photobucket or shutterfly or Flicker and then put a link to them in a comment here? We can then see exactly what you have. Thanks!
Will,
Do you plant heirlooms? Those plants have been around a very long time and should be able to withstand most tomato diseases. Great solution to the problem, planting more!
Yes I do Keith. But most of those are the most susceptible to diseases like late blight. You would think your reasoning would be correct, but for some reason it does not work like that. Planting more does ease the pain in a bad year. And adds to the bounty in a good one.