That old song may end up having more poignancy than anyone would have guessed. New Scientist reports that we may have out-clevered ourselves:

Virtually all bananas traded internationally are of a single variety, the Cavendish, the genetic roots of which lie in India. Three years ago, New Scientist revealed that the world Cavendish crop was threatened by pandemics of diseases such as that caused by the black sigatoka fungus. The main hope for survival of the Cavendish lies in developing new hybrids resistant to the fungus, but this is a difficult and time-consuming task because the seedless modern fruit does not reproduce sexually and has to be bred from cuttings.

For all the talk about monocultures in software (i.e., Windows), this looks like it might be the real deal.