Tomato Leaf Yellowing

Most all of the tomato plants have started to show brown spots and yellowing lower leaves.  This has been a problem before in the garden around this time of spring.  After copious researching of various tomato diseases, it is my thought that this problem is Early Tomato Blight, a fungus, and airborne.  It seemed to spread overnight throughout the garden area, and the windy conditions we had on Friday and Saturday would support the thought of an airborne disease.   
Here are a couple of links that may help you decide for yourself and determine the method of treatment.  Last year, I just removed the infected leaves, and continued to get tomatoes. 
This photo is from http://edis.ifas.ufl.edu/pp121 , which is for IFAS at the University of Florida, one of my most used reference bases.  If IFAS does not have an answer, then your probably have the rarest plant problem in Central Florida!
Another link, http://www.megagro.com/greencure-tomato.htm?gclid=COLU6tW9oqgCFYjt7QodW0YgIA is really for an organic cure.  I have never used their products, but the description of the Early Blight really seems to fit the problem in our gardens.  The lower leaves are infected first.  There is a store in our area that might sell a similar product.  I will get the name from one of our gardeners and post it.
If anyone has additional information on this problem, PLEASE add it to the Blog.