Re: Micheal Gros fungus?
Mine have identical symptoms with the black markings on all the leaves. They were all good until our winter hit. Every other banana variety growing in close proximity has no sign of this disease. I'm guessing they are not as cold tolerant?
M.velutina, M.ornata, M.zebrina, M.sikkimensis, M.basjoo,
M. rajapuri, Blue Java, dwarf red dacca, Williams, Dwarf Chinese plantain (same as dwarf cav?), dwarf cav, super dwarf cav, Choui cau (Senorita), Goldfinger, Pisang ceylan, and Four Tongan varieties I'm working through,one is popoulu. Newly added: Gros michele, lakatan and saba.