DETECTION Cercospora stizolobii IN CULTURES OF Stizolobium aterrimum AT QUEVEDO, ECUADOR

Abstract

The black mucuna (Stizolobium aterrimum Piper & Tracy) is an annual forage plant,which belongs to the Fabaceae family, it is used to feed cattle, pigs and goats in Ecuador. Lesions were found (reddish-brown circular spots with darker halo ) on trefoils of S. aterrimum located in the experimental farms “La María” and “La Represa” belonging to Quevedo Technical State University (UTEQ) later those trefoils were carried out to the Microbiology Plant and Environmental laboratory, UTEQ, where carried out macro and microscopic observations to determinate the causal agent for this symptomatology. Also it was carried out isolation of the tissue with presence of lesions, it was sown like resource of culture (PDA). They were identified using stereoscopic magnifying glass, structures with fungal character corresponding to sporodochia which excel from the surface of the trefoils of S. aterrimum. In the structures were obtained conidia in differents lengths, thin, multicellular, dark, measuring between 4-7 μm in width and 43-140 μm in length. The organism did not develop in the middle of culture in isolations that were carried out. By the morphological features presented, the organism corresponds to a fungus with pathogenic character called Cercospora stizolobii, which would correspond to the first report in Ecuador, associated with S. aterrimum. Thereby, it must work in a better health management in the production of S. aterrimum plants to diminish potential damage and to live with this disease.