Collaboration between the UCO's Agronomy and Genetics departments was key to sequencing the genome of this pathogen, which is responsible for losses of up to €50 million per year. Cercospora leaf spot is an olive tree disease that causes defoliation and lower yields. It is caused by the fungus Pseudocercospora cladosporioides, which affects only the olive and wild olive trees. Chlorotic spots appear on the upper surfaces of the leaves, and on their undersides, in a tell-take leaden color caused by the fungus's fruiting bodies. The introduction of vulnerable varieties in Spain, such as "Frantoio", and the reduced use of copper as a preventive treatment, are making this disease increasingly prevalent.
