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Tomatoe woes


I need advise on saving my tomato plants.  

I use a modified square foot approach to gardening and have approximately 6 
tomato plants (3' - 4' tall in cages along 2 tomatillo plants) in a 4ft x 
4ft 
area.  My problem is the lower leaves/stalks and those that touch the 
infected 
leaves develop black spots, turn yellow, and wilt away.  I have some fruit 
on 
the plants but their production seems to have diminished significantly since 
the
initial fruit appeared and little new fruit is developing (perhaps energy is 

being directed to fighting off disease).

I see no insects.  We have had a very dry period here in northeastern Ohio 
during July when the symptoms appeared.  The disease seems to have affected 
the 
bottom leaves first.  Also, I have planted the Gurney hybrid plants in the 
same 
location now for 3 years.

I have carefully cut off all infected leaves/stalks and sprayed the plants 
thoroughly with fungicide (hose end sprayer/ Ortho product - I forget the 
name).
 Unfortunately the yellowed and dying leaves/stalks are still present and 
are 
spreading.  I had the plants cleaned up pretty well after pruning, but now 
the 
wilt? is spreading (approx 10% of each plant are dying).

I would like to salvage the plants.  Does anyone have any suggestions?

thanks, 
Rob
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