Crepe Myrtle (white powdery leaves) - Knowledgebase Question

Hayward, Ca
Question by judysatarian
July 2, 2009
How do I get rid of the white powdery stuff on the leaves of my 2 year old Crepe Myrtle?? And what is it?


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Answer from NGA
July 2, 2009

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It sounds like your tree may have powdery mildew. You may want to prune to remove the infected leaves, and to open the canopy up to better air circulation. You must also rake up and remove any fallen foliage as that will spread the disease. Here is a good home remedy: Make a baking soda solution and spray it onto the affected plants. To make this solution mix 1 tablespoon of baking soda and 2 1/2 tablespoons of ultra-fine horticultural oil with a gallon of water. The oil is slightly fungicidal and acts to help the baking soda coat the leaf and hang on longer. Apply as a spray as soon as the mildew appears and every 10-14 days thereafter. Be sure to coat all surfaces!

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