I suppose it's "tracheomicotico", so... I found "Malsecco is a tracheomicotic pathogen of lemon which causes yield losses and plant death. The disease is widespread in some countries of the Mediterranean. And it is a threat for any other lemon producing countries. The pathogen may attack other citrus species as well. Special care is required for usual symptom defection in mother trees and nursery plantings to avoid the spread of pathogen. The alternative method of culturing pieces of wood is time consurning and needs skilled personnel."