Weekly evaluation of some phytopathological descriptors (PJFT, PJFN, PJF3, EEM, IS) of BSD on field treated revealed lower levels of infection by the black Sigatoka. Values of the EEM (DSD) were significantly reduced after each treatment, youngest leave touched by the disease (PJFT)is remained higher than those of untreated field, level of youngest leave necrosed (PJFN) was higher than 6 and index of disease severity (IS) was cancelled at the 16th week of observation. Conclusion and application of findings: Foliar spray spray with the NECO can be used as biological mean of fight against Mycosphaerella fijiensis and can be associated in an integrated system to to fight against black Sigatoka disease in banana field.