Figure 1: Symptoms and causal agent of Cercospora leaf blotch on Waych’aPaceña potatoes (Solanumtuberosumsubspandinega). A: yellowing area (red arrow) and soft yellow halo (white arrow); B: advanced leaf blotches become black; C: on the underside of the leaf, a grey colour appears, similar in appearance to downy mildew; D: close up of the grey layer on the underside of a leaf; the hairs show hyphae on them; E: a hair covered with hyphae of P. concors; F: conidiophore and conidia of P. concors.