Carolina Gardening: What is this?, 1 by gessieviolet

gessieviolet wrote:
The large plant in the first photo ( Zebrina Malva sylvestris Hollyhock Mallow Plant) was a beautiful lush looking flower. Suddenly the older leaves developed yellow bumps and spots (like the 2nd photo) and are dead.

What is happening? These plants are reseedlings from an heirloom that was on the lot when I first moved here many years ago, so I prefer to save it if I can. Can this be treated or should I just destroy these plants?