The Q&A Archives: Brown powdery spots on geranium leaves

Question: What are the brown powdery spots on the underside of my geranium leaves caused by and how do I get rid of them?

Answer: Rust is a fungal disease that attacks many plants including geraniums, different rusts being specific for each host. It looks just like its name -- little pustules of brownish-red. If the infestation is minor, remove and destroy infected leaves. Mulch to prevent water splattering on the soil and spreading the disease. Replace the mulch mid-season and dispose of it completely at the end of the season.

« Click to go to the homepage

» Ask a question of your own

Q&A Library Searching Tips

  • When singular and plural spellings differ, as in peony and peonies, try both.
  • Search terms are not case sensitive.

Today's site banner is by plantmanager and is called "Captivating Caladiums"