Copper spray is my secret weapon for any type of blight. Doesn’t necessarily CURE it, but it does slow it down to give your tomatoes a fighting chance to reach maturity. :)
I have some and will probably need to get more.
Here’s a recipe for controlling tomato blight that I found online. It’s a lot cheaper than copper sulfate.
3 Tbsp baking soda
1 gallon water
1 Tbsp cooking oil
3 Drops dishwashing detergent
Mix thoroughly and spray on plant morning or evening once a week.
If 3 Tbsp baking soda isn’t quite cutting it, up it to 3 1/2.
Waiting for our copper spray we had to order it.