My friends hollyhocks have had all the leaves infested. At first there are...
My friends hollyhocks have had all the leaves infested. At first there are all these small bumps and then the leaves are full of holes. They are in a flower bed with lilies and peonies and only the hollyhocks have been infested What is it and is there anything she can do? See photo.
Mower County Minnesota
The hollyhocks have been affected by a fungal disease called "hollyhock rust." Some varieties are marketed as rust resistant. Otherwise go to the following websites for reliable information about hollyhock rust and ways to control it.