If you have a diseased plant, yes, kill it, get it out of there. If it is early blight, copper could help protect the other plants. But it's also possible you bought transplants that were already infected.

My suggestion would be to get new plants from a different place, and plant them in a different location (if that's possible).

In my gardens, I do "preventative spraying" to help my plants defend themselves against things that kill them. This thing about "organic" has become OCD to a lot of folks and I think that's not good. This world we live in now is getting more difficult to plant something and never spray for pathogens and critters.

It truly has come down to whether or not you want to harvest or watch plants die slowly. Seems like such a waste of time and material to just do nothing.

JMHO

Ted

This early in the season here I probably would replace it but then I have lots of free back-ups. Otherwise most will just remove the affected foliage and institute a regular fungicide spraying program to help keep it in control if you haven't already done a preventative spray and keep the plant. The spores are airborne so pulling a plant doesn't eliminate contamination of the other plants and it still produces fruit.

So IF EB is actually what you have and you are using fungicides wait to see how it does.

Dave

I have had years where the fungi was more virulant than others, but simple practices have always lead to good yields for all my plants. I have ditched one plant over the last 5 years, it was an orange blossom. It was so infected that in the first two weeks I knew it was a lost cause. Other than that, copper spray, keeping the base of the plant mulched and the leaves away from soil splash has done the trick.

This year one plant has been infected. I trimed the branch that showed the symptoms and am keeping a close eye on things. So far not a single other instance.