Powdery Mildew

Powdery mildew is a white, powdery fungus on surface of leaves that thrives in warm, dry, humid climates.
 

It is usually found in lush, irrigated landscapes with humid microclimates.

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​First, improve sunlight, eliminate excess fertilization, increase airflow, and modify irrigation that contributes to a humid microclimate.

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If the above cultural practices don't help, a horticultural oil can be applied.

 

In some cases, systemic fungicides may also be applied.