Peronospora sparsa
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Author(s): Jean L. Williams-Woodward, University of Georgia
Source: IPM Images
Peronospora sparsa Berkeley 1862
This oomycete is widely distributed and causes downy mildew on roses. Other members of the rose family like blackberry or craneberry can also become infected. The symptoms include reddish-brown leaf spots that may have an angular shape. Sporulation can be seen on the undersurface of infected leaves at high humidity. Infected leaves often turn yellow and drop. Export losses of cut roses due to the disease can exceed 10%.
The sporangia can remain viable for about 1 month and spread by rain splashes or through the air. During the winter, the oomycete is assumed to survive as mycelium and/or as oospores in plant debris or in the soil.
Synonyms:
Peronospora rubi
- Other images of Peronospora sparsa (IPM Images - click to enlarge)
symptoms on rose
mycelium on rose
sporangiophores and sporangia
