Mycosphaerella fijiensis is a phytopathogenic ascomycete fungus that seriously affects banana trees. Its spread occurs through spores that are spread by wind and water. Under favorable temperature and humidity conditions, the fungus germinates on the surface of the leaves, penetrating through the stomata. As it progresses, it develops specialized structures for the colonization of leaf tissue, weakening the plant and reducing photosynthetic capacity. The infection remains latent for several days before symptoms become visible, favoring its spread. Over time, the fungus forms new sporulation structures in the foliar lesions, closing its cycle and restarting the infectious process. The persistence of the fungus in the residues of infected leaves contributes to reinfection, making its control difficult.