SUMMARYAscospores ofDidymella applanatawere released in rain and dew throughout the summer, the highest concentrations occurring in May when new raspberry canes were emerging.Infections on new canes did not develop until later in the season, when ascospore concentrations were low although pycnospores were present. Lesions first appeared near the base of the green canes just below the point of attachment of the petioles; they were not associated with obvious leaf, petiole or bud infections. Once maturation of the canes occurred, further infection was prevented.