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Ra Re Rh Ro Ru

Ramularia rhei

Ramularia rhei, fungus that thrives under cool, humid conditions.

Also known as:
Rhubarb Leaf-spot
Cercospora leaf spot (beet)

recognize the fungus Ramularia rhei
Ramularia rhei on sorrel, photo: TristramBrelstaff - CC BY-SA 3.0

Ramularia rhei (rhubarb) – Rhubarb Leaf-spot, fungus that thrives under cool, humid conditions. Fungus hibernate on plant remains.
Ramularia beticola (beet) – Ramularia leaf spot, fungus that thrives under cool, humid conditions. Fungus hibernate on plant remains.

Where to find

Control

Remove affected stems and leaves (rhubarb). Remove infested plants (beets),

Prevention

Clean up dead leaves (rhubarb) in late summer.
Work under or clean up leftover (sugar-) beet plants in the fall. Make sure no (sugar-) beets are planted in the same place for at least four years (crop rotation).