FIGURE 5. Pathogenicity assay on guarana plants. Negative control showing absence of symptoms (A) and scanning electron microscopy of control (B). Symptoms of leaf spot caused by Pseudopestalotiopsis gilvanii, strain INPA 2913 (C) and scanning electron microscopy of inoculated leaf showing conidia, red arrow (D). Symptoms of leaf spot caused by Neopestalotiopsis formicarum, strain INPA 2016 (E) and scanning electron microscopy of inoculated leaf showing conidia, red arrow (F), fall of the leaves caused by Ps. gilvanii (G) and N. formicarum (H).