← Diseases

Black Spot

[NOTE: Diplocarpon rosae causes black spot on roses (Rosa spp.); Septoria and...

11 host plants

Last updated

Data Coverage 3 of 6 dimensions
Causal Agent
Host Plants
Symptoms
Management
GDD Threshold
Regional Notes

Circular black spots with yellow halos develop on leaves. This fungal disease favors wet foliage. Improve air circulation and remove fallen leaves.

Plant cultivars known to be resistant in your area. Note that the cultivar Carefree Spirit was the first landscape shrub to survive for 2 years in AARS tests without any fungicide and voted a winner.

Quick Reference

Causal Agent
[NOTE: Diplocarpon rosae causes black spot on roses (Rosa spp.); Septoria and...
Host Plants
11
Spread
Rain splash from infected fallen leaves to new foliage; overhead irrigation e...

Management

Vulnerability Window

Apply frequently in wet spring weather and occasionally in summer.

Cultural Controls

  • Plant cultivars known to be resistant in your area.
  • Note that the cultivar Carefree Spirit was the first landscape shrub to survive for 2 years in AARS tests without any fungicide and voted a winner.
  • Avoid dense plantings and shaded areas.
  • Avoid overhead watering that keeps plants wet for extended period of time.
  • Rake up and burn all leaves in a rose planting at season's end.
  • Prune canes back to two buds if canes are infected.

Host Plants (11)