Lasiodiplodia theobromae is a phytopathogenic fungus that severely affects the cultivation of avocado in any state of development, causing infections in the area of pattern-graft insertion of young plants, "descending death" of branches, formation of chancros and necrosis of the peduncle of fruits . The objective of the present investigation was to study the incidence and severity of the disease known as regressive death of the avocado. For this, production fields of avocado var. Hass grafted on the Zutano, Lula and Topa Topa patterns, located in the Virú province of Virú district in La Libertad. Three batches of 2.28 ha were evaluated for each graft holder, the sampling unit was 10% of the population (105 plants per batch). The incidence was determined by recording the presence or not of the disease and for the severity a descriptive scale of the symptoms of the disease was used based...