Stage 5 is when the elliptical spot is totally black and has spread to the underside of the limb. It is surrounded by a yellow halo with the centre beginning to flatten out. 5 attribute variable_of entity 4 Stage 4 appears on the underside as a brown spot and on the upper side as a black spot. Stage 2 appears as a stripe, generally brown in colour and visible on the underside of the leaf, later the symptom also appears on the upper part of the limb as a stripe, the yellow colour of which resembles the stripe at stage 1 of Yellow Sigatoka. The colour of this stripe will change progressively from brown and later to black on the upper side of the limb, but will retain the brown colour on the underside. 2 acronym method_of Stage 6 is when the centre of the spot dries out, turns clear gray and is surrounded by a well-defined black ring, which is, in turn, surrounded by a bright yellow halo. These spots remain visible after the leaf has dried out because the ring persists. 6 3 Stage 3 differs from the previous one by its dimensions. The stripe becomes longer, is enlarged and in certain conditions (weak inoculum and unfavourable climatic conditions) can reach 2 or 3 cm. 1 Stage 1 appears as a small depigmentation spot whose whitish or yellow colour resembles stage 1 of Yellow Sigatoka disease. These symptoms are not visible in transmitted light and can be observed only on the underside of the leaf. scale_of Faures stages of development of BLS disease scale (1987)