Black Leaf Spot
Diplocarpon rosae
1 host plant · Fungal
Last updated
Data Maturity Baseline
This profile contains verified disease data from extension databases. Regional field notes and expert review are in progress.
Black Leaf Spot can show up on landscape plants, producing visible damage that ranges from leaf spots and discoloration to branch dieback depending on severity. Early detection gives you the best management options.
Start with sanitation: remove and dispose of affected material as you find it. Thin dense growth to improve air circulation, and redirect irrigation away from foliage. If the condition persists despite cultural adjustments, your local Extension office can help identify the pathogen and recommend targeted treatments.
Quick Reference
Agent Type
fungal
Causal Agent
Diplocarpon rosae
Host Plants
1
Management
Cultural Controls
- Remove and destroy infected leaves.
- Leaves may be composted if completely decayed before spring.
- Make use of any practice that encourages decomposition of fallen leaves prior to spring bud break, such as mowing or flailing.
- Apply urea to leaves after leaf fall in autumn to enhance decomposition of fallen leaves.
Host Plants (1)
Delphinium Larkspur