Which cultural practice helps prevent powdery mildew as part of IPM?

• A. Increase airflow and proper spacing
• B. Water plants overhead daily
• C. Tight, crowded planting
• D. Plant susceptible varieties only

Answer: (A)

Powdery mildew is easier to prevent when you break up the humid microclimates that form around leaves. Increasing airflow and spacing between plants reduces the amount of lingering moisture on foliage and speeds up drying, which makes it harder for the fungus to establish and spread. This is a key cultural tactic in IPM because it uses environment and plant spacing to deter disease rather than relying on chemicals.

Watering plants overhead daily would keep leaves wet and raise humidity, creating favorable conditions for the mildew to grow. Tight, crowded plantings reduce air movement and trap moisture, also promoting the disease. Planting only susceptible varieties increases the risk rather than reducing it. So the best practice is to increase airflow and maintain proper spacing.