Leaf Blight

Water-soaked lesions expand into brown spots with distinctly darker margins, causing significant premature defoliation that weakens the plant substantially. Remove affected foliage immediately when symptoms appear, improve soil drainage around roots, and space plants for air movement. Rake fallen leaves regularly throughout the season. Avoid overhead watering which keeps foliage wet and spreads fungal spores.

Propagate from disease-free stock plants. Use seed from British Columbia coastal, low-elevation populations.