Hmmm.. Well, they make some treatments to deal with that virus. I recommend that you take a few samples (from each spot you mentioned) of soil, and send them to the Alabama Dpt. of Ag, or the ag college for a test. They can tell you what virus it is and how to deal with it.
Viruses in Texas are rampant, and one has to be really careful ... Seems there's a damn virus for every plant here.. The answer for me is to buy plant starts from local nurseries or veg farms where they have been hardened agin the local problems. I also use a spray on product that is a three way prevention too. Last year, my 'maters were the best they'd been in years here. As usual, once the extreme heat starts they all went dormant until the fall. I usually cut them waaay back when it gets hot too. I read one fool on the internet literally cuts all the branches and leaves save for a handful and then just keeps them watered until the heat fades... I'm not that anal, but I do trim them back because all it does is grow vines and leaves all summer and is a damn mess come the fall.
The missus will eat them peppers raw right off the vine like a child with a damn apple straight from the tree. She complains all winter because the ones she gets from the store have no flavor... I grow Cayenne right next to the bell and serrano peppers and they all share a bit
Squash? I end up putting boxes of them out on the county road with a sign on front of them saying "Free to home w/iron skillets" They just get clean the hell outa hand here on this patch. Now, I almost never plant them next to the 'maters, mostly on account the squash plants want a lot of area to spread out. Maybe that's why I am not getting the viral's on them.
I have gumbo earth by default here, but I spent the first four years here folding cushion sand, and gumbo buster compost (Compost w/1/4 sized bits of extruded shale that was sent thru a kiln) to a depth of 10" in the garden square. I used the disc attachment on the tractor to start as that raw earth was like the concrete you'd find on the interstate. After that, it was hand tilling till it was fine and loamy to the touch.
Every year, it gets a refresher load of gumbo buster and tilled in...