Leaf Spots and Twig Blights
Diaporthe vaccinii (asexual Phomopsis vaccinii)
12 host plants · Fungal
Last updated
This profile contains verified disease data from extension databases. Regional field notes and expert review are in progress.
Blueberry species develop leaf spots and twig death from Diaporthe fungi entering at leaf scars. Purchase healthy material, prune out dead growth 5-6 inches below symptoms, maintain spacing for air flow, and harden off plants before winter. Tool sanitation prevents spread between plants.
Remove blighted tissue promptly, cutting well below visible symptoms. Improve air circulation by thinning dense growth. Avoid overhead watering, especially during bloom and new growth periods when tissues are most susceptible. For recurring problems, preventive fungicide applications timed to protect new growth can reduce infection, but cultural controls should be your first approach.
Quick Reference
Management
Cultural Controls
- Purchase healthy planting material and/or do not use plants with injured branches. Prune out, remove, and destroy infected and dead branches. Prune 5 to 6 inches below symptoms. Avoid wounding or injuring plants. Encourage plants to harden off in winter to avoid frost damage. Provide adequate plant spacing and manage canopy size to promote good air circulation.