Podosphaera pannosa

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Rosa infected by Podosphaera pannosa (click on image to enlarge it)
Author(s): Parthasarathy Seethapathy
Source: IPM Images

Podosphaera pannosa (Wallr.) de Bary (1870) - (rose powdery mildew)

This fungus is widely distributed and causes powdery mildew on plants of the family Rosaceae. Especially rose and peach become infected. Several plants from other families have been also reported to be susceptible. Infections are characterised by a cotton-like cover on the leaves, stems and fruits. The disease reduces the grows and the commercial value of the plants.

Infections are initiated by spores landing on the leaf surface, germinating and penetrating the leaf tissue. At a later stage the mycelium grows out of the leaf, forming a white layer on the surface. Conidiophores are produced that release asexual spores which disperse by wind. In autumn, sexual fruiting bodies (cleistothecia) are formed that overwinter. They open in spring, releasing the ascospores.

Podosphaera pannosa var. persicae - causes peach powdery mildew
Podosphaera pannosa var. rosae - causes rose powdery mildew

Vernacular names
• Deutsch: Echter Rosentaupilz
• English: powdery mildew of peach
rose powdery mildew
• Français: oïdium du pêcher
oïdium du rosier

Oïdium leucoconium
Sphaerotheca pannosa