Tropical Race 4

Tropical Race 4 (TR 4) is a strain of Panama disease, a devastating illness affecting bananas. This disease is caused by the soil-dwelling fungus Fusarium oxysporum. TR 4 specifically threatens the Cavendish banana, the most common commercial variety.

The fungus enters the banana plant through its roots, spreading through the vascular system. This causes discoloration, wilting, and eventual death of the plant. Once established in the soil, the fungus is extremely difficult to eradicate, making future banana cultivation in the affected area challenging. Efforts to control TR 4 focus on developing resistant banana varieties, as fungicides and soil treatments are largely ineffective.12