Bacterial wilt on tomatoes
This has been an ongoing battle in my vegetable garden for three years. 2012 was an excellent year, but since then, my tomatoes of differing varieties have fallen victim. As you can see by the photo, part of the plant is affected first and can go down as quickly as in two days. I had the local home extension office do a soil test and they said it needed nitrogen. That didn't seem to help. Either that, or I didn't amend the soil enough to make a difference. Do you have any ideas? Thanks so much!
Crop rotation is very important to keep disease down in the garden.
Solarizing the garden can also help.
Here are some links with more information.