YELLOW LEAVES: Banana tree leaves that are turning yellow and dying indicate that the tree is not getting the nutrients it needs. Inadequate fertilization, poor-draining soil, overwatering and fungal infection are some of the common reasons a banana tree.
The best way to properly balance soil nutrients is to conduct a soil test and only fertilize with the nutrients shown to be lacking. If the soil test shows that no deficiency exists, the soil pH may need adjusting, the soil may be slow to drain, or the tree may be overwatered. Too much water prevents the roots from harvesting nutrients from the soil.
A banana tree infected with fusarium wilt will — as the name implies — looks wilted due to the lack of water reaching its leaves. The yellowing will progress from the oldest to newest leaves.
Unfortunately, there is no known cure for fusarium wilt. The best way to address this soil-borne disease is to plant resistant banana tree cultivars. Contact your local extension office to have your soil tested to diagnose fusarium wilt.