Diplocarpon rosae

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black spot on rose leaf (click on image to enlarge it)
Source: Wikimedia Commons

Diplocarpon rosae F.A. Wolf 1912 - (blackspot of roses)

The fungus causes an important disease of roses in various regions. The spots might reach a diameter of up to 15 mm and often merge, forming larger lesions. The disease leads to yellowing and weakening of the plants. Outbreaks often develop under humid conditions in susceptible cultivars and with dense plantings.

Black, asexual fruiting bodies (acervuli) can form as early as 1 week after an infection and produce two-celled conidia that disperse through rain splashes. The fungus survives the winter on plant debris and new infections are initiated in the spring. The sexual stage has been rarely observed in the field.

Vernacular names
• Deutsch: Sternrußtau der Rose
• English: blackspot of roses
• Français: taches noires du rosier

Synonyms:
Marssonina rosae