CMV or herbicide....HELP

[TerpGal]

I have had to replace all solanums this year due the the leaf ferning and tight fiddlehead looking deal that started with the toms and eventually spread to every pepper. I replaced the toms first then the peppers. Well now my yellow brandywine and german johnson are beginning to show the signs again. Strangely if it WERE CMV, my Charentais melons which are planted in the same bed are showing absolutely no signs of infection. I think my neighbor used week and feed at the beginning of May but can't be sure about that. I didn't use any manure this year, just Leafgro that is produced by Maryland Environmental Services and is tested for aminopyralid. If it is CMV, how can I prevent all the plants from getting it again. If they do, I am done for this year haven't seen any aphids and have been spraying with Sevin.