TR4A is a type of agricultural pest known as the Tropical Race 4 of the Fusarium oxysporum fungus. It primarily affects banana plants, particularly the Cavendish variety, which is widely cultivated for commercial production. This pathogen causes a disease called Panama disease, leading to significant crop losses and threatening global banana supply. The spread of TR4A is a major concern for farmers and agricultural experts. It can survive in soil for many years, making it difficult to eradicate once established. Efforts to manage TR4A include developing resistant banana varieties and implementing strict biosecurity measures to prevent its spread.