Description: Although rust is widespread, it is most consistently
a problem in western states.
Yellow "rust" spots appear on the topsides of leaves
during cool weather in spring or late fall. Infected
leaves become twisted and dry. Spores infect leaves
when rain, dew or fog occurs at temperatures from 55°
Solution: When rust
is first noticed, pick off and destroy infected leaves
and spray plants with Soap-Shield® Fungicidal Soap*.
Repeat sprays every 7-10 days as long as conditions
favor rust infection. Remove and destroy diseased leaves
and twigs in the fall.