Raffaelea lauricola is a phytopathogenic fungus that causes the disease known as bay wilt in avocados. This fungus is mainly transmitted by the ambrosia beetle (Xyleborus glabratus). Infected beetles bore into the trunk and branches of trees, introducing spores of the fungus into the plant's vascular system. Once inside, the spores germinate and the fungus establishes itself in the xylem vessels, where it multiplies rapidly. The fungus produces hyphae that invade vascular tissues, blocking the flow of water and nutrients and causing wilting symptoms. Conditions of high humidity and warm temperatures favor the development of the fungus. The rapid proliferation of the fungus within the vascular system of the tree leads to obstruction of the vessels, resulting in the death of the affected tissues. This process can be extremely rapid, especially in young or weakened trees.