Powdery Mildew of Strawberry
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Powdery mildew (Sphaerotheca macularis) primarily affects leaves; however, petioles, flowers, and fruit may also become affected. White, powdery fungal growth develops on lower leaf surfaces and succulent tissues. Leaf edges roll up as disease becomes more severe. Powdery mildew is more severe in high tunnel plantings than in fields.
Powdery mildew causing leaf roll.
(Photo: Mike Ellis, The Ohio State University)
Powdery mildew fungal growth on leaf surface.
(Photo: Mike Ellis, The Ohio State University)
Management:
- Consider resistant cultivars.
- Increase air circulation by spacing and thinning.
- Use fungicides if disease becomes severe.
