Should You Prune Moldy Squash Leaves?

Pruning Infected Foliage

Removing leaves with powdery mildew (white/gray spots) helps if:

• Infection is localized (few leaves).
• You remove entire leaf at stem.
• You destroy leaves (trash/burn—don't compost).
• You sanitize tools between cuts.

Limitations

Pruning alone won't stop mildew—spores are airborne. Combine with:

• Improved airflow (thin plants, trellis).
• Base watering only.
• Organic fungicide (potassium bicarbonate, neem, copper soap).
• Resistant varieties next year.

When Not to Prune

If > 30% foliage infected, pruning stresses plant more than disease. Focus on sprays and cultural fixes instead.