brown / yellow spots on back of leaves - malva zebrina
Webbit Posts: 2
My malva zebrina plants have been having these yellow / oragne spots on the back of it and it has now spread to the other side of the garden. I don't know what they are and how to treat them.
Your help are much appreciated.
Looks like hollyhock rust to me - most rusts are host specific so will only affect plants of that family.
Info here https://www.rhs.org.uk/advice/profile?PID=564
Hope that helps
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.