Which of the following is true about powdery mildew management?

Which of the following is true about powdery mildew management?

• A. Powdery mildew does not respond to cultural practices
• B. Powdery mildew can be reduced by improving airflow and reducing shade
• C. Powdery mildew is only a cosmetic issue
• D. Powdery mildew cannot infect ornamentals

Answer: (B)

Powdery mildew thrives when the leaf canopy is dense and air movement is limited, creating a humid microclimate on the surface of leaves. By opening up the canopy and reducing shade, you improve airflow and increase sun exposure, which lowers the humidity around leaves and disrupts spore germination and infection. This cultural approach directly reduces disease pressure without chemicals, making it the most effective option. It’s also not just a cosmetic issue—powdery mildew can weaken plants, and many ornamentals are susceptible, so management isn’t limited to aesthetics.

Powdery mildew thrives when the leaf canopy is dense and air movement is limited, creating a humid microclimate on the surface of leaves. By opening up the canopy and reducing shade, you improve airflow and increase sun exposure, which lowers the humidity around leaves and disrupts spore germination and infection. This cultural approach directly reduces disease pressure without chemicals, making it the most effective option. It’s also not just a cosmetic issue—powdery mildew can weaken plants, and many ornamentals are susceptible, so management isn’t limited to aesthetics.