My plants are dying from the top. The leaves are turning yellow, dying, have large brown discoloration on a large part of each leaf, and the stems are falling off. The brown discoloration (not dry but wet) extends around the entire perimeter of each leaf.
Below find examples of the problem. If this is an untreatable systemic disease there's nothing to be done. Perhaps it's early blight which is treatable? Or maybe it's environmental?
I've dealt with late blight before but this is nothing like that. It's happened much earlier in the season and suddenly. The plants have been in the ground for almost 3 weeks. I have several different varieties and they all look about the same--Better Boy, Early Girl, Celebrity. etc. Any advice would be appreciated.