I hope it isn't Late Blight. Possibly it's Grey Mold which isn't so bad.

Linda

I've only ever had experience with Late Blight once, back in 2010...and it sure looks like that's the issue.

Unfortunately that sure looks like late blight to me as well. Where are you located?

Sadly that looks like textbook late blight to me. IMO those plants and fruits should be removed and disposed of to prevent further spread. They can be burned or bagged/tossed. Spores will travel with the wind and the fungus will spread quickly. Act now. Do not use any of the plants debris for compost. Next year pull any volunteers. Use fungicides for prevention.

Shell

Clearly late blight. If weather prognosis doesn't look very dry starting soon, you might as well pull them. If it will be dry for about 2 weeks the disease will stop and some of them could still live (the ones with black stems are almost surely goners).

You should probably report this to your county.

https://usablight.org/map

That's late blight, IMO. Bag the plant and pull it. Seal the bag and throw it away. Do not let debris from the plant sit around in your yard.

Late blight is a community disease and spreads on the wind easily. If you have nearby farms, your plants could be a danger to them.

And, yes, report it to your county extension.