Question
I finally have my going greatguns this year and now i have that fungus (AGAIN)I believe its a blight(yellowing and wilting of bottom leaves). i recently sprayed a soapshield before vaca to prevent what has been a annual frustating event in my garden and came home to initial phases of disease!!
!.have not over watered(tried to water from roots}

Answer
Will:

The blight condition that you have described is hard to deal with. It is a fungus that is soil born. Copper and/or sulfur sprays can prevent further development of the fungus.

After you have finished this crop, till your soil good and spray good with the copper or sulfur sprays the try to kill the fungus.

Best wishes.

Don