Septoria sp. is a genus of pathogenic fungi that affects a wide range of plants, including blackberries. These fungi produce asexual spores called conidia, which are dispersed by wind and rain. The spores germinate when humidity conditions are adequate, penetrating the plant tissues through stomata or wounds. Within the plant tissue, the fungus grows and develops structures known as pycnidia, which are small fruiting bodies where new spores are produced. These spores are released and disseminated, restarting the infection cycle. The fungi can survive on infected plant remains or in the soil during the winter, remaining dormant until environmental conditions are favorable again. The reproduction and spread of Septoria are strongly influenced by climatic conditions, especially humidity and temperature.