I am having problems with black spots on the stems and leaves of my tomato
plants. I have about 10 plants and about half are affected. I have been
spraying them with Ortho Disease Control and removing the affected stems and
leaves but the problem seems to get worse. I have even been watering close to
the ground to avoid splashing dirt on the plant.

Is there any way to save my plants? I would rather not have to destroy them
and start over if I don't have to since I have invested a lot of time into
them.