Black Knot on European Plum
Fungal disease producing characteristic black warty galls on plum and cherry branches.
Black Knot on european plum
Detailed guidance for this section is being prepared. Check back soon.
Symptoms
- Black hard warty galls on branches
- Branch dieback above galls
- Increasing gall size over years
Controls
- Prune galls 4 inches below visible margin in dormant season
- Burn or bury removed material
- Fungicide at bud break
- Remove wild plum and cherry hosts nearby