Answer: If there's a fungus on the plant, I'd suspect that conditions are too moist, or air circulation is less than required. Since you're consuming the shoots, I don't think a fungicide is the answer. Banana is actually a shrub with a fleshy stem. In regions where winter temperatures get low, the entire top of the plant freezes down to soil level. It is removed and new sprouts appear in the spring. I think I'd cut back the affected parts of the plant, improve the air circulation, reduce the watering, and wait for healthy new shoots to appear.
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