Candidatus Liberibacter is a genus of bacteria that are primarily known for their association with plant diseases. These bacteria are typically transmitted by insect vectors, such as Asian citrus psyllid, and can infect various crops, particularly citrus plants. The presence of Candidatus Liberibacter can lead to significant agricultural losses due to diseases like citrus greening disease. These bacteria are classified as phloem-limited, meaning they reside in the phloem tissue of plants, where they can disrupt nutrient transport. The symptoms of infection often include yellowing leaves, stunted growth, and reduced fruit quality. Effective management strategies are essential to control the spread of Candidatus Liberibacter and protect affected crops.