The irregularly distributed asci contain eight unicellular ascospores each. Both ascospores and conidia germinate directly with a germ tube. The disease spreads by wind born dispersal of ascospores and rain splash of conidia. "Diplocarpon rosae" over seasons as mycelia, ascospores, and conidia in infected leaves and canes. These ascospores are globose and located in asci. These conidia are much more potent than ascospores in terms of infection rate. Mitotic divisions within the developing spores populate each resulting cell in septate ascospores with nuclei. Typically, a single ascus will contain eight ascospores. The eight ascospores are produced inside an ascus. The classification was based on different morphological characteristics such as filiform ascospores and cylindrical asci. After dispersal, the ascospores may germinate and form a new haploid mycelium. The asci elongate into the ostiole, and discharge the ascospores outward. The asci in the pseudothecia produce ascospores that can then infect plants. Then the ascospores are released from ascus. Each ascus contains one to four ascospores.