Oak wilt is a serious disease that affects oak trees, caused by a fungus called Ceratocystis fagacearum. This fungus disrupts the tree's ability to transport water and nutrients, leading to wilting and eventual death. Symptoms include browning leaves, leaf drop, and a rapid decline in tree health. The disease spreads through root connections between trees and by beetles that carry the fungus. Infected trees can die within a few weeks to a few months, making early detection and management crucial. Preventative measures include avoiding tree wounds and implementing proper sanitation practices in affected areas.