English walnut (Juglans regia) has become an important crop in Chile, representing 11.5% of the total area fruit trees, surpassed only by grapevine. As Chilean industry rapidly expands, young orchards are at risk from emergence new fungal diseases. Botryosphaeriaceae and Diaporthaceae fungi have been recognized as main causes wood diseases walnut, with symptoms dieback, canker, blight. In winte...