AbstractViable conidia ofSeptotinia podophyllinaare found on sclerotia on dead last year's leaves ofPopulusin spring.Prunus serotinais described as a new host. Inoculation experiments on leaves in petri‐dishes withPopulus‐ andPrunusisolates demonstrated no host‐specificity. A possible introduction of the organism from North‐America, its native area, into Europe and Asia is con