Remove the yellowish leaves.

Prune here and there.

Mulch.

Spray fungicide.

See what happens.

I removed all the affected leaves and pruned here and there. They weren't getting much if any sun down there anyway. The plants are really bushy as they made a lot of suckers and I didn't prune any. I can see the value of pruning suckers to make a more vertical plant. I didn't see any obvious signs of fungal or bacterial disease... we'll see what happens. I'm not going to mulch right now as the ground needs to dry out a little.

I prune mine seems to make them less disease resistance, If you had that much rain I would but some Miracle Gro on them as all that rain washes the nutrients away.