New diagnosis
Plant photo

Diagnosis Complete

Black Spot (Diplocarpon rosae)

Analyzed April 29, 2026

Primary Diagnosis

Black Spot (Diplocarpon rosae)

severe
Confidence82%

Diagnostic note

Classic presentation of rose black spot disease. The characteristic dark lesions with irregular, feathery (fimbriate) margins surrounded by extensive yellowing chlorotic halos on what appears to be rose foliage is highly diagnostic. The severity is rated as severe due to extensive leaf yellowing, large coalescing lesions, and tissue necrosis indicating advanced infection that will likely cause premature defoliation.

What the AI detected

  • dark black-brown irregular lesions with feathery margins
  • extensive chlorosis surrounding lesion sites
  • yellowing of entire leaf blade
  • lesions coalescing into larger necrotic areas
  • symptoms on mature leaves typical of fungal progression
  • leaf tissue browning and desiccation at margins

Alternative possibilities

#1Black Spot (Diplocarpon rosae)
82%
#2Anthracnose
12%
#3Cercospora Leaf Spot
6%

Treatment plan

  1. 1Remove and destroy all affected leaves immediately
  2. 2Rake and dispose of fallen debris around plant base
  3. 3Apply fungicide containing chlorothalonil or myclobutanil
  4. 4Water at soil level to avoid wetting foliage
  5. 5Improve air circulation by selective pruning

Treatment guidance informed by published plant pathology research.

Treatment informed by peer-reviewed plant pathology research · Explore studies at consensus.app