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I have a young burr oak that has a white tint on the young leaves at the ends of the branches. The leaves are also curled up. The rest of the tree seems healthy, and it is thriving. The same whiteness (fungus) is on our potted zinnias. What is causing this?
Last Updated: January 08, 2008
You have the same fungus, powdery mildew, on both your burr oak and your zinnias but probably not the identical species or type. The fungus will do no permanent damage to the tree other than causing malformed leaves this season. If the white covering is thick on your zinnias, you may want to pull them and replant, monitoring for disease signs, and using a preventative fungicide spray.
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