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.
For more information on Sycamore Scale, go to the following link:
|Susceptible Plants to Powdery Mildew
|China aster (Callistephus)
||London plane tree
|Coral bells (Heuchera)
Reference: Gubler, W. D. 'Powdery Mildew On Ornamentals'. UC IPM. N.p., 2009. Web. 15 July 2015.
UC Statewide IPM Program, University of California, Davis, CA 95616,. Table 2. Common Ornamentals Susceptible To Powdery Mildew. 2009. Web. 15 July 2015.
UC Statewide IPM Project,. Powdery Mildew, Microsphaera Alni, On Sycamore Leaves.. 2000. Web. 15 July 2015.