When you dig them up, do the roots look like this?
I have 3 which have the same problem with their growth, and dug this one last week. I assume this is the same culprit in all. If anybody knows what it is or wants more pics and a video to look at, let me know. There was heavy black stuff on the lower corm and as you can see, no roots. It seems to be in only one area of my yard, but is not good for bananas, whatever it is.
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Varieties I supposedly bought: Manzano, Cavendish, Blue Java, Sweetheart, and Gros Michel.
What it seems I actually have: Brazilian, Cavendish, Namwah, Dwarf Red, Gros Michel, Pisang Ceylon, Veinte Cohol and SH 3640, and American Goldfinger. FHIA 1, Paggi and FHIA 17... Always room for one more.