What type of organism primarily causes Fire Blight?

Fire blight is primarily caused by a specific type of bacteria known as Erwinia amylovora. This bacterium infects various plants, particularly apple and pear trees, leading to the characteristic symptoms of fire blight, such as wilting, brown, and blackened tissue that resembles the damage caused by fire. The bacteria thrive in warm, moist conditions and can spread rapidly in orchards, particularly during flowering. Understanding that fire blight is a bacterial disease is crucial for developing effective management and control strategies to protect susceptible crops. The other types of organisms listed, like viruses, fungi, and protozoa, do not cause fire blight, which helps clarify the specific nature of this plant disease.