Leaf Scorch And Leaf Roll
Sphaerulina azaleae (formerly Septoria azaleae)
22 host plants · Fungal
Last updated
Leaf edges and tips turn brown or bronze and appear scorched, often with yellowing between the scorched areas and healthy green tissue. The symptoms develop through the growing season and worsen during dry spells. Leaves may curl at the margins or roll inward. On dogwoods, the marginal browning is distinctive and can affect the plant's ornamental appeal. Overly wet or dry soil, salt injury from overfertilization, and compacted soil are common culprits in gardens.
Leaf scorch usually isn't a disease problem requiring chemical control but rather a cultural one tied to water stress and soil management. Your job is matching water to your plant's needs: both overwatering and underwatering cause scorch symptoms. Dogwoods especially need consistent moisture without waterlogging. Improve soil drainage, avoid compacting soil during construction, and prevent root and trunk injuries. Proper fertilization prevents salt accumulation that burns leaf margins; overfertilizing makes problems worse.
Quick Reference
Management
Growing season, particularly during wet periods
Moisture on leaf surfaces; warm temperatures; stress conditions (drought, mineral imbalance, root damage)
Cultural Controls
- Maintain consistent soil moisture—avoid both overwatering and underwatering.
- Provide adequate water during dry periods, applying water to soil rather than foliage.
- Ensure good soil drainage to prevent waterlogging and root stress.
- Avoid overfertilization, which can increase susceptibility to salt injury.
- Remove and destroy infected leaves and twigs to reduce inoculum.
- Rake and remove fallen leaves in autumn to eliminate overwintering sites.