Powdery Mildew
What is Powdery Mildew?
Powdery mildew is a common disease that affects many species of trees and other types of plants. (See Susceptible Plants below). You can identify powdery mildew on your plants by the white, spore growth that forms on leaves, flowers and fruits. “This disease can be serious on woody species such as roses, crape myrtles, and sycamore trees where it attacks new growth including buds, shoots, flowers and leaves.” (Gubler)
How does Powdery Mildew spread?
Powdery mildew is spread by wind to new hosts. In some plants such as roses, powdery mildew can survive season to season. The most susceptible places for plants to develop this disease are shaded areas and temperatures of 60 to 80 degrees.
Treatment Options:
- Fungicide Treatment
Tree DoctoRx offers a fungicide treatment to control the powdery mildew disease. The best time to treat your trees and shrubs are during the spring season. Multiple applications may be needed for control on this disease. Contact us for more information.
For more information on Powdery Mildew, go to the following link:
http://ipm.ucanr.edu/PMG/PESTNOTES/pn7493.html
| Susceptible Plants to Powdery Mildew | ||
|---|---|---|
| Aster | Crape Myrtle | Oak |
| Azalea (deciduous) | Dahlia | Pansy |
| Begonia (tuberous) | Delphinium | Phlox |
| Calendula | Euonymus | Ranunculus |
| California poppy | Forget-me-not | Rose |
| China aster (Callistephus) | Gaillardia | Rhododendron |
| Chrysanthemum | Hydrangea | Rudbeckia |
| Clarkia | Lilac | Snapdragons |
| Columbine | London plane tree | Sweet pea |
| Coral bells (Heuchera) | Lupine | Verbena |
| Corn flower | Mint | Vinca |
| Cosmos | Monarda | Zinnia |
