Master Gardener Decision Support Guide
Woody Ornamentals
Rhododendron
The disease you have described is powdery mildew. In the past
powdery mildew has not been a major problem on rhododendrons.
You cannot cure infections that that have already started, but
new powdery mildew infections can be prevented by spraying with
Immunox or Bayleton.
For more information see
Note on Rhododendron Diseases
,
Note on Powdery Mildew
.
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Rhododendron,
Woody Ornamentals,
Master Gardener Decision Support Guide
Designed by David
Goforth on December 17, 1997.
Contents modified on May 24, 1998.
Contents checked on May 24, 1998.