The Q&A Archives: Powdery Mildew

Question: I live in the Houston area of Texas and have 20 or more large Crepe Myrtles 8 to 10 yrs old,and for the 1st time have developed mildew. Do you have any suggestions for removing and controlling the problem on a large scale plan, over half of the shrubs are effected and its traveling fast to the others.

Answer: Cathi,

There are a number of options for powdery mildew control on crepe myrtles. Among your least toxic options are products that contain either of the following ingredients: neem oil (not just Azadirachtin, but instead "neem oil") or potassium bicarbonate. Potassium bicarbonate is similar to baking soda (which is sodium bicarbonate) and is sold under the brand name Remedy. Read the label for application instructions and frequency. As a general rule, these sprays generally need to be applied on a 10-14 day basis when conditions favor powdery mildew development.

Synthetic fungicides containing bayleton are a very effective and longer lasting control option. Your County Extension Office can offer other options for powdery mildew control.

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