I have looked at hundreds of pics trying to ID the problem with my plants.
Affected leaves are toward bottom of plant. Tops seem healthy. Fruit looks good but not ripe yet.
Plants are mulched and some pruning. Feed is fish emulsion and some manure.
The problem started around the time the first fruit set.
It's getting worse but progression is slow. Cucumbers may be suffering too.
I am a novice and could really use some help figuring out what the trouble is and creating a plan to fix it.