The Cavendish that we eat today wasn't eaten in the 50's. Back then, you'd eat the Gros Michel. I think they were all wiped out so we swapped to the Cavendish some time ago. It is cyclical when we focus on one variety like that. Source: IEEE Spectrum article I recall from a long time ago ~2003?
https://en.m.wikipedia.org/wiki/Gros_Michel_banana