The perfect breeding ground for powdery mildew is a shady spot on a 60 to 80-degree day. Powdery mildew spores are carried by the wind, floating freely and invisibly throughout the garden.
How to identify powdery mildew
Getting rid of powdery mildew
Prevention is your best weapon against powdery mildew. Here’s how to avoid this fungus:
- Choose resistant plant varieties
- Plant in full sun
- Avoid excess fertilizer
- Provide good air circulation.
If powdery mildew manages to sneak into your garden, pick off and destroy the infected parts and spray infected plants with water early in the day. If this doesn’t do the trick, try applying neem or jojoba oil. If the fungus persists, you may want to try a sulfur or other type of fungicide. Some gardeners who have struggled with powdery mildew infestations in the past apply sulfur as a preventative. Follow package instructions closely.
To learn more, visit the following University of California Integrated Pest Management pages:
- Powdery mildew on vegetables
- Powdery mildew tips
- Powdery mildew on ornamentals
- How to combat powdery mildew on plants
Original article by Marie Narlock, Faith Brown, Nanette Londeree
Edited by Susan Saltzman