Most likely blight, either early or late,,,UW Plant Pathology Dept was doing free testing last year, you could contact them,,,Amanda Givens is very helpful
http://www.plantpath.wisc.edu/wivegdis/
late blight is NOT good, recommended you pull the plants and burn them, or double bag and landfill. (This is the same blight that caused the Irish potato famine, needs to be addressed seriously)
that said there are a host of diseases that present themselves best to check on the testing
stiff and sore today did alot of running yesterday, had a plan for butchering early things got messed up, but I did do 8 of the roosters, the 21wk Marans and Olive eggers,,,,today they get finished and frozen, one in the stock pot right now,,,
had a doe rabbit drop a her 1st litter 3 days early on the wire, got a box in and setup, 7 out of 8 kits were fine last night, hopefully she mothers them well
Jim glad you are safe and found the problem
might run to that auction today, call in to the owner checking on some sexlink pullet
need to get chores done,,,bbl